初中計算題練習題匯總-共39頁

1、初中數(shù)學計算題強化訓練一、有理數(shù)的加、減混和運算1. (-0.7 ) + (-0.4 ) + (-0.3 ) +0.5 2.( -3.2 ) + (-9 ) + (41)+ (-?)656+ (-5) + (-7)3. ( + 15) + (-20) + (+28) + (-10)4.(-3.25)+3.75-1+2.5+3 3+(-4 1)5.-2.6+-1.4+83-(-3 |)+4 I312_3116.(-2 |)+(+34)+(-3 g)+(+2*(-1 -)+(+1 3)7.(- 1 )-(-1 3)-(-1 2)-(+1.75) 8.2 3433-(-8 1 )+(-2 1)+0.

2、251.52.75 4249.(. 4(-2)(+3)(-1)10. -111.-32 1 5 1+(-3 1)+(-5 1)+(-2 1)12.2 13(-旦)(-1)-319347471215151220132 g 112 2 315W.25+(3) 4(l-+l-)4 14.53.74 6 8(0.75 )+p125_+(7) (41-) +3+3.7816. (+0.5) (31) +2.75 (+71) 174-尸(+g) -心 -4 2 3 3 4 41 318. (1 彘) (25005) (+1i) (7.2 ) (+25005) (0.25 )19.-34+(500) +52

3、 2 4 3 (520) 2O1IN1IN+M (0.6) (3 9)3 5 3 5211+1 (6) 5+5+_4_7 2 1123，(oolQoolxg；5 、 3,卜 5 、 7， 25，13()+()6 4 6 1226一(+17)+6.25)8)+。-75) 22、有理數(shù)的乘、除、乘方混和運算1 . (-3 ) 2 2. -32 3. (-3) 3 4. -335. (- ) 26. (-) 37. -3 X 42338. (-3 X4) 2 9. -32X 2310. (-3) 2X (-2 ) 311. -212. -0.1 X (-0.1 ) 3 13 . -2X (-0.1

4、) 3 (-0.2 ) 2+ (-0.8 )14. -62x (-12)2-32)3x (-3)15. (-2 ) 2- (-52) X (-1 ) 5-24 + (-3 ) X (-1) 4216.-2-3+2- (-2) 3+| (-2) 2|(1-1.2 X 5) + (-2) +2 17 . -32+ (-26218. -2 3- (-3) 2-22X 1-8.5 +4-)2 19. -32X 23 20. (-3 ) 2 (-2 ) 221. -2 2 32 22. (-2 2 3) 223.(-)3-24.25.乜 26323(-3)227. |-2| 328. -0.2 X (-

5、0.1 ) 329. (-2 ) 2 (-1 ) 5- (-2 )30.- 3+ (-3) X (-4) 31.17-8 - (-2 ) +4-(-2 ) 32 . -23-3 (-1 ) 3- (-1 ) 44335、0.8 年一1()8、(一3 十一|)36、(4)+( 12) 咕37、4X( 2)3(3)238、(32 X+21)+(-3,)39、(；)2 (2)%1)54、7瑞8) 14、(2)3X( 4) X.25 41、(75% )21)+( 125)宗一75R 0.24)4342.-鳥；17.43.-21; 44.(2)3(0.5)235-3 245. 23-32-(-2) X7

6、)；46. - 14- 2 - (-3)2.6（三）有理數(shù)加、減、乘、除、乘方 混和運算|-24|3）1(+1)43.-32X (-2 ) 2+0.254X (-4 )33 + 2019 4. -3- (3)3 3 + 0.4 X (-1-1) - (-2) 5.(2-3+6.,2_、/_ 2_、(4x7x3) (5x5x + 5)7. 25a-3a45-6a-(3a-1)-(7a-2)(-60) -228.-(-6)6-32 (-5) 3+ (1-0.2 X3) + (-0.2 ) 9 . 2-，8 + (-1)2-(-4/ 2 + (-2)511. -62X (-1 1)2232+ (-1

7、 -) 3x (-3)212. -2 乂 (0.1 ) 3 ( 0.2) 2+ (-0.8 )- 55-2- 4-3 + (1-1.2x-)-(-2)p-2 614. -101 + 9x1+ (-2) X (-64)15849.-5-1-0.25 X (-5)81616. -1 1 + 1 1+1 X (-2)22 317. -1 1-1 + 1 - X -(-1)22318.(-工)+(2-工+1 2303 10 65一，一、2，一、19. (-3) X (-2)20.-3 2+ (-2 1 ) 2 (-2 ) 2+|-2 2| 212-23- (-3)25-8.5弋)222. 14329

8、47 +36 30 1323. 914 +57 27 4924. 1527 34 X 325. 14737 46 +4（四）代數(shù)式混和運算整式的乘除法公式：(am) N=amn(a- b) N= aNbNa -9 =a1 . 2x2y3 (得xyz2)2. (-4x2y) .(丈丫之).(gy3)3. (-2an+1bN) 2 - (-3aNb) 2 (-a2c) 4 . (-1ab2c) 2 - (-1abc2) 3 - (12a3b)231 一 ，2 o5. ( -ab) (ab 2ab231 十 b4 一 36 . 2 (3x-2y) (x+5y) -6 (x-y) (3x+2y)7.

9、23X 178. (a+b-c) (a-b+c)9. 100.5 X99.5210. 2x (x+y) (x-y) (z-x ) (z+x) + (y-z ) (y+z)112011. (y+2x) (2x-y) -2 (3x-2y) (-2y-3x ) - (31x-3y) (2x-3y)12. (1 4) (1乙)(1 義)23413. (2a+2b+1) (2a+2b-1) =63,求 a+b 14 . (2+1) (22+1) (24+1) (28+1) (216+1)15.20192 2019X 201916.20192-20192+ 20192-20192+221217.(a+b+

10、c) 218.(991) 219. 1005- 2220.(x+1) (x+2)(x+3)(x+4)21 . a2+b2+c22a+4b-6c+14 = 0,求 c-a+b 的值22.已知a+b= 5,ab=3,求a2+b2與a-b的值23.已知x+1 = 3,求x2x+的值,xx4+ .1的值。4x24.(a+b) 2 (a-b)25.已知 a-b = 5, ab=-3 ,求(a+b)26. 9x2mxy+ 16y2,求 m27.已知(a+b) 2=1, (a-b) 2=25,求 a2+b2+ab的值。有理數(shù)混和運算（四）整式的加減、化簡、求值。1 . 6a+7a2-5a-6a 2 (其中

11、a=-3) 2 . 5x2-3x 3-x-4+3x 3+2x-x2-9 (其中 x=11)23. (3a3-2a2+a-1) - (4a3-2a2-3a+2)(其中 a=-1 )4. -x-2 (x-1y2) + ( -y2- -x)(x=-2 , y=2 )233235.3xy2-xy-2 (2x-3x2y+2xy2) +3x2y6.22，-1、(x=3，y=-3)(m3-2n2) -2m3-2 (2m-1 )，1、(m=- = -1) n7.7ab-4a-36ab+5 (ab+a-b) -7a-2(a=1, b=1)8.(2x2y-2xy2) - (-3x2y2+3x2y) + (3x2y

12、2-3xy2) (x=-1 , y=2)9.xy+2y2+ (x2-3xy-2y 2) - (x2-xy) (x=-52，y=2)510. (2x-3y-2xy ) - (x-4y+xy ) (x+y=5, xy=-3)、2_,_、2_,_132(2a+b)-3(2a+b)+8(2a+b)-6(2a+b)(aTb = -3)12.2 (3a-1) -3 (2-5a+3a2) (a=-1)313.3x2-8x+x2-12x2-3x2+1 (x=2) 14 . 4x2+2xy+9y2-2x2-3xy+y 2 (x=2, y=1)15.若(x+1) 2+|y+2|=0 ,求 5xy-|x3y2-4x

13、y+1x3y2-gxy&V-xV 的值16.1 x- (2x- 22 y2) +3(-x+ y ) (x=-2 , y=-) 23217.1 (3y-3) - 1 (y-1 ) - 3 (1-y) (y=1) 84818.已知：代數(shù)式3-2x2+3x+3x2-5x-x 2-7求當x=-1時，求這個多項式的值;2當x為何值時，這個多項式的值為 2。13.2解一元一次方程2x -2 5x 1/=12x+1 10x + 1_3.y-324x - 1.55x-0.8=1.2- x0.50.20.15.x -3= -1.6x - 3十6 - x0.20.5=i(11 2x7.|x-1|213x-2) =

14、9.3x-2(x-1 ) =-1-5x10-71._.2x-7(x + 1)+(x 1)=8863 x 2x 3 3x 1 -122x 3-x =(x-1 )=1- x414. |x-5|=31516.3 (2y+1) =2 (1+y)173-x x-8 _ i 2_ 一18.1 -Zx,x 1 2x 11F19. 2 (y-3) -6 (2y-1 ) =-3 (2-5y)20.(x-5)21111x-1x(x-)222=222.0.02x d -0.18x 0.18 1.5-3x+1 =0.030.122x 1.7 - 2x / 一=10.70.324.2 -3x8251 1 、r1 - 2

15、x (3x - 5) = x2 2二元一次方程組=3y4x =03y -x = 55y+2x = 25.2x y = 12x + y = 55y3x 2y =174x-3y =52x - y = 23x -5y = -92x + 7 y = 67 j2x+2y=82x 2y =43x + y = 177x-2y =18m匚=2.2 30.2m 0.3n =2.810.3x -5y =86x+7y = -111O.2x+0.5y =2O.4x+0.1y =0.4123x + 2y = 8、2x y = 313.2(x + y) -3y =104(x9) =3(y2)14；3p =5q 12P3q

16、=115x = 52x 3y = 1x -2y =4、x +2y =8173x-2y = 15、5x4y = 232x - 3y = 3、3x 2y = 718co z 00 9IIIIA A z co T- COX X m z CO T-.6 ClaAA xCXIA+x/ guA 等甲為西 9+中 寸 N d + Af+xi0 HCOCXIAgCXIX9, OUZLAgL xfglH A寸 + XJ 9HAgxcocoeONLu ACXI1 a gH Aco XCXILuA9X07 aco+xn4(x +y) 父 x y) H 2GO2x + 3y 2x3y + n 4 32x + 3y +

17、 2x 3yII00、2(x + y) 3(x y)u 4(x + y)+ 3(x y) H百42:2 302m +0.3n H 200/2(x+y) 3y U74(x9)3(y2)36.38.40.-3 2-2(3x 4)3(y1)H43o.2x+p5y UP2o.4x + o-1y U0.4父x+ y) 4(x y) u 441.x + y = 280096%x 十64% y = 2800 父 92%42.x f y 55129 - 60x y 3_ = _,4 8243.I 、 3(x _ y) = 4003(x y) =40060x y =14045.x + y =501500x +2

18、600y =900047.49.44.x y46.1 15% - 1-10%x y = 950f3 y=21x+1=5(y+2)482 3、3(2x -5) -4(3y+4) =5H + Y=1、3 224(x -y -1) = 3(1 - y) - 2% 1=22 350.x(4 - y) + y(x + 2)= x(8-y) +y(x + 3)= 50081451.9-(x +y) =18523,、,-x+-(x+y) = -1,3252.x 2 = 2(y_1)2(x2)十(y 1)二553.55.57.2x -y +x +2y 736x -y二 6454.15x + 17y = 221

19、、14x + 15y = 208,3-=156.二22x + 3y ,2x-3y2x43y332x -3y21x31V3y =93x =1158.L71559.x% +y% =3.24%(2000x% +1000y%)(1 -20%) =43.9260.x + y = 5030%x + 15%y = 20%x50J62.61；x(y+4)-y(x-3)=136x(y +1) +y(5 -x) =852 , 一 一 2 一x(x+4)+10 = x -3y22_ .x - y + x = (x+Y)(x - y) + y+ 1山十3 =363.61064.x y x-y = 16104y-Z =

20、 0 求 X2+y +Z2 的值 心x + y8=0 xy+yz + 2zxx+2 y-1十=265.3266.x +2 1 - y+-23 322x y 6 = 4x -3y -7 _ -6x -7y 104 一 6 一 868.x + y = 100J5%x+30%y =100乂 20%x -2y x 2y 二67.325(x -2y) -4(x 2y) = -1一元一次不等式的解法與應用1 .把不等式的解x （表示在數(shù)軸表示2 .求不等式xw 5的非負整數(shù)解。3.求大于-1但不大于4的整數(shù)數(shù)。解不等式并把不等式的解表示在數(shù)軸表示1. -2a-1 -82. 2x-3 834. -2 (3x

21、-2) -3 (x+5)5. 3 (x-1 ) - (x-5 ) x-3廠 一 、,、x 52x 上1- -6. 2 (2x-3)5 (x-1)7. x-1 2p8.12x+10(10-x)1059.5x-9 3(x+1)10.1+2x 142512.x13v 2x 3 x -x213.2-x4-114.2x-1 5s 1 -2x16.4x-1017.4(x-1)+ -x21+1x 219.x 2-3x 1 d=1220.3x 1+5x22.x -1 3x -1 x-3 (x-3 )24. ”一丁號 25. W/ + 2)+7 26. f V 零一 1W+238.：-乎-。39.5xl3_3x

22、z215240.*141.x 1 x -1、x -142.x -1 x 243.2x -1 5x 144.2x48.32(x1 2-1 ) 9 (x+ )349-2-4-tt_3x5x 4 (x-5)5x+ 95254. 111(壬 4) 6 8 - 19 7 531 + 2(x+,)=5,求 15- 30 (x+61896 焉)的值。56.x -2 x 21.257. 2.4x -4Z53x 558x -1x2_1.2.1 - x61.x 1x-1 x-1_68332665.-1”163.y 1 3y-i64.二3汩3xl42566.一3(x -1) 4(x 1)15-9xb1產 xb2.x(a x，；b3.；x )ax，；b4.；x(a xb二、基本方法.求不等式組的解集x -1x -22.x-2tox+4；03.；x:3 x(54.x-0.01x-2l3x+105.，2x76.x 2 0x -4.0x 5S7.2x + 1)3x-25：3 2x8.3x + 1)02x7-29.1210.武x +1) x；2x+3 4 53x-2)411.3x+5(142x1 之1x 8 3x - 212.x 3CXIL + xcoxCXIe Alxgco X)寸8 網(wǎng) XcoNg)g+xaco)(7x)g 8 + x叱 0Al0 x)g8 + xcoL + X2X (L + XQJ