七年級上一元一次方程50道練習(xí)題(含答案)

1、八,1，2x +1 = x+4；2次方程50道練習(xí)題兀(2) 0.8x0.1=0.5x 0.7(4)3x 1 7 x3 "6"一 15(3) x4 = 2x+3 x；22(5)x -1-142x 3 x 1+633 2 123(6) ( x 1) 2 - - = - x2 3 23211 x 110-3x.1111(7) 21 (x-)=(2x) (8) (2x+3)+(2x + 4) = (2x + 5)+(2x + 6)33232345(9) 5x+2=7x- 8;(10) 7(2x1)3(4x1)+2(3x 2)+1=0(11)5x -1 _ 763712 一(12)

2、 ；2(2y 1)+2(1 2y)=22y1)；(14 ) 3 - 2x_1 一22 3(13 )2x -16(15 )1FS2 13 2 <2 力 123 4 113(16 ) ( x-)8 = x 14 3 2422 -18x x -x 2(18)69(19 )(x 1) 30% (100 -x) 25% =2x5 ;2 -3x 5 x(20 )2(21)6 tM1卜3+5口(22) 2(2x-1)-4(4x-1)-5(2x+1)-19=0(23)3x -1 彳 3x 51 二34x -4-212()0.4x 0.9 0.1x -0.5 0.03 0.02x Jr)0.50.20.0

3、33 2 1(25) ( 2 3 41 2x x 1) 2一22二(26) 234(5x-1)-8-20-7=1(31) -(- 4) 6 8 =1(32)3x=2x+5(33)2y+3=y9 7 53-1(27) 2(0.3x-4)-5(0.2x+3)=9(28)2(x+3)-2(x+1)-5=0(29)3x- 中=16 號一蓄 (30) 藍 K"1(36)10x+7=12x-5-3x(34)7y=4 3y(35)y=3(37)8x 4+2x= 4x3(38).2 (3x+4) =6-5 (x-7 )2x-4 5x 12=1 -36(40)111x_x_(x_)=2222x - 2

4、(42) (x-5)+J2(41) 2(2x-1)_2 5 = 0.2 -20x-3.50.010.2(43) 4xT5.5x-0.8=1j+30.50.20.1(44), x-x 2-1(45)0.4y 0.9y -5 0.3 0.2y0.50.3(46)3(x+2) - 1 (2x-3)=2(2x-3)-1 (x+2)32(47)3 3 3( 3x-2)-2-2=03 3 3 3(48) 5( y + 8) 5 = 4(2 y7);(49)3(1 -3-x2-3x6(50)1.8-8x _1.3-3x _ 5x - 0.41.220.33(1) x H2 J ( 2) x H 2 5 (3) x H7 5 ( 4) x HI 5 (5) x H 55 (6) x H 3；3(7)1 7 1 (8)xhi (9) XH9 (1。) X HI - (11) XHW (12) yu )2 8 2(13) X3 (14) x& (15) x21 . x H8 22.XH1 23.XH3 24.XH92PX"27 XH&O 2