初中有理數(shù)計算題500道及答案(已整理)

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1x2x3Ix2x3x4+…+lx2x3x...xl00100-1lx2x3x->x1001.. ——^―+ -+lx21x2x31x2x3lx2x3*411111?2lx”3x…x100100151x3 3x6S(1-1)4(1-13 、32 _1 1Ixfl+Tn’100 ? +6x10 10x151)(1.1)6 610+ Ix2x3x...x9950+ 1225x1275Z1 112251275]1x2x3x...x100_1274212753一11(14-2)x(14-24-3)-7+2—1+2+3，(1+二+…+99)，(1+2十…十100)1+2+…+991+2+…十100限式=1T工；刖1+!+???+100, 1 5049=1 = 50505050原式=1-(二+二+1x33*66x1010十，”十 4”55!」二+1—336610 45482原式=（白+或"（為乜11

+ +446688108xio"‘11 十10121214）」483434A1、13214，214原式Lx4 4850X-X…X X 49494’-3’1-!)，0+ 所以,3 3 33315025=-x—=—2494912x23+25x3j+3jx43+…+1763-644=1F1?997+997+ + +???+ 2x44x6 1994x1996+…+1994199699"&-康卜-997997 1996TOC\o"1-5"\h\z…『+3' 10 2'+4,20 3'+5， 34436—z——=—.—z——=—.—z——=一2'-1 3 3’-1 8 41-1 15一丁10 4 20 、4 34 、4 由于一二2—.—=2-.—=2—3 3 8 8 15 15可見原式、4、4r4 _4可見原式=2x98+4x2:-1"[ 4- =2x98+4x+???+ 98x10098100=196+2x[ — )I299100?199=196+3-9900,24751=198 4950488489490491487十+…3x55x799x1014沖。?出制原式小4=；x(l+1=一411111 1??33557 99十1十丁一十1+4'-1 6:488489490491487十+…3x55x799x1014沖。?出制原式小4=；x(l+1=一411111 1??33557 99十1十丁一十1+4'-1 6:-14 101 1015+66+77+88+9t9+101.1Ak」】，】、1 1 3■一■1 4 ? 一? ? +?一. 22一+一一(―?―)+..+?-+-)22-，—N—*5x66x77x88x99x105667 91051010―362+3 3+4 4+5 5+6 6+7 36】1.1.1原式=一十-++ ++ + =—+—+572x3 3犬4 4x5 5x6 6x7 57233417=4原式原式5784537383111111211+1+1+】+1=>一?—?一?—4—+—?—+—+—?一?一734454756674923303141492330314121-11102+33+444s54-6"77+KX*99+1。9?7 --xX8—|x7I-xS84乳3.原式工4k55x66K77xS8?Q9mID495.停式—二十［十；十二十4、3qI I12I11+-+-±5355—Ii1 2496,原式.5十i十不.；IQIS1920isiq20r-3KIX.I I497.原式， xI + 200Xlx2(MI72x21N>6200S—M )i2007x1.”中72007I 1iooi'iTzooft2(km>^i.i t200XU2O072x2O(K>200N200H2(M)7x| 2IM?|x200f)20)8I2007十…十20081x20072A2006 2007mI20081x20062006x12007_2006<l K[(-4-—+—+—=*200?uI200722006…4- +.).(■+ 20()71I2(KK>4 +川2006I-■■■■*1(t一十十工

2008I200722006十一—，f t—-20071I2006十…十十"2006I1200X21X172(力7 2IH5O2N17x1919x21；17x1919x21；17x1919x21；17x1919x21；胃一(￡)，(％*)*去.1 1 49=1+ =—502550499.原式=3-1 +35-17-1 13-1 + +?■.$ 3x53x5x7 3x5x7x9x11x13fi+l+_L+ ?_1-仕+，+1 33x5 3x5x7x9x11；【33x5+3x5x7x9xllxB508=1 3x5x7x9x11x13135134135135T324 + +…+1x3x51x5x717x19x211x3 + -

3x53x55x72929+…+ - 17x1919x212 2 4——+——+ +1x33x55x72829+17xl9-19x21所以原式二 + +…1x33x528*17x191x33x55x72s2s29 1 512-133379=19x21i73=399=3991,2、4,1、，1、293.t+(--)+T■*■(--)+(-j)294(-1.5)+4-+2.75+(-3-)295(-1)2006i-(-24)x(-i-2--2.75)8 35 2 1 1312—x(—)x(-2—)x(-4-)31 9 15 23 ■ 5 ■ 7 . .15> \ 4 i(Y) 484,一； 丁+一; 丁+-; r+**?+-： ??十J十 2 1十iw