《初中数学初一年级数学计算题经典练习.pdf》由会员分享,可在线阅读,更多相关《初中数学初一年级数学计算题经典练习.pdf(32页珍藏版)》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、111.51.4 4.35.2 3.660.511 1 36243510.235234 2212 142112110.3333 232 2.57.3 2.5(2.4)2.5(1.7)|5|125123139+5(6)(4)2(8)46x 2x 123x 123x1 15(1)15(0.25)423941111(81)(32)48()494366123542(2m2)4m248(2xy)(2xy)(3x2y)(3x2y)(x2y)(3x2y)3x先化简后求值:m(m3)(m3)(m3),其中 m422 (143222xy)(12x y)(x y)3343123224(3)13()|4|3(2)(
2、1)(2)2542x-19=7x+31化简(求值)2(x2y xy2)2(x2y x)2xy22y的值,其中x 2,y 23x 15x7=14612116()2 4(3)5x263x3 x3 2x232 先化简,再求值,已知a=1,b=的值12123323,求多项式a 2b 2ab a b2ab b32-2-(-3)(-1)-(-1)-1-(1-0.5)2345122-(-3)332211(22)3(11)(2)(3)2()2 6 32(x1)448(1611412)(13)32-(-6)-123-3(-2)3-(-1)42938x31/2x186 2132-(1-0.5)(-113)2-(-
3、3)2(3)22123|-3|(0.25)(2)611111(2)(3)248371113223(2)250()(6)2(7)29126先化简,再求值:3(x y)2(x y)2,其中x 1,y 3.4772(6)2化简:(4a23a)(2a2 a 1)(2a2 4a)483先化简,再求值:2x15x12(x2)2x113621131x 2x y2x y2,其中 x=2,y=。323231314 2(3)2(4)2()30(6)64解方程:43(2 x)5x解方程:2x 1x 21323579111315311()8(48)26122030425646121213()21022+22(1)10
4、+|1|23231()(24)317315346()(60 60 60)521277716()2(1.5)5364(2.5)(0.1)22(3)3(3)(4)1.51.4 4.35.2 3.611x ,y 45先化简,再求值:(2x3y)(2x2y)1,其中2251 13133224 5 4 2 41 24 5 248648412x23x 2y2343x 2x23x2y2x2yxyx22x241163211 1 0.5 2.57.3 2.5(2.4)2.5(1.7)362433510.225化简求值.2xy+7x3(2x1)2xy y,其中x 2,y 。2212818(10)(2)(5)513
5、15 24424348()1636(6)72(8)514223225 3x2(x3y)23(x2 y)4(2 x23y)12(2312)(5)2121112(4316 32)(23)4.51(5)(125 0.7)52512 (2)0 147 24(29)(2)(32 23)|5|11223153 0.53(231223)(3)321 3232(0.2)252 3(1)6442133413221171 ()(1)3;()()()3 (3)(1)2232(3)2(32)(2 3)2 2 32;1+(2)+2351163448120095253 0.81216 (15)215219;(23)(58
6、)(0.25)917(2315)20083(1)402819243 211 232 60 431215222312162318 41212413232(2)3(4)262123333 5273.432132412化简:3(2x5)+6x 5.6(14)(16)(+6)解方程:5(83x)=x51(4)20.25(5)()382先化简,再求值:当x 111231x(2xy2)(xy2),其中x ,y 4223231,y 3时,求代数式3(x22xy)3x22y 2(xy y)的值223(4)(28)7 4(3)15(3)50先化简,再求值:2x+(x+3xy+2y)(x xy+2y),其中 x=
7、4x32(x1)1222221,y=3.2x1x 24 x3627733212(134832)8(1)(2)3(7)14x 3(20 x)32x3 x 23x61x 13 2x1236x74x-53(4)2()30(6)42332先化简,再求值:(5a+2a 3+4a)(a+4a+2a),其中 a123(4)8(3)3(3)42()()(0.25)344223()2(1)47a 5b(15a b)933(2x2 xy)4(x2 xy 6)先化简,再求值:111(4a2 2a 8)(a 1),其中a 242112514117(2)()2()3|(5)9(15)(2.531)25828224当x
8、1,y 3时,求代数式3(x22xy)3x22y 2(xy y)的值。21(2)3 2(4)103(4)2(132)2422化简求值:5a 3a 2(2a 3)4a,其中a 122 2 2020 (1414)(1818)1313 1 1.6 6()2 2(3 3)3 3(2 2)2 2 2(3y y 1)7(y y 2)3(8)+10+2+(1)5+(0.8)+1.2+(0.7)+(2.1)+0.8+3.5(17)+59+(37)(3 3x x3 3 3 3x x 1 15 5x x 3 32 2 4 4 6 66)+3+9+(4)+(7)12+(23)+45+(112)+(3)18.65)+
9、(6.15)+18.15+6.15(4111112)+(3)+6+(2)(0.5)+3+2.75+(5)332442(1.9)+3.6+(10.1)+1.4 (7)+(+11)+(13)+9333821192+(2.16)+9+(3)49+(78.21)+27+(21.79)1111252121先化简再求值:4a b(2ab5a b)2(3a bab),其中a=1,b=22222234x3 5x(-3+3)(-1)26x35x3412008-(1-0.51)3-2|-3|+(-6)(-2511)-|+|(-)12283(-2x-5)+2x=9 2x-化简求值:2x+(-x+3xy+2y)-2(
10、0.5x-222212x 1=-163112xy+y),其中 x=,y=3.220.4x0.90.030.02xx5335(-+-)(-7)40.50.032741431313121(0.28-14+4)122143422113530.713.5(-32.5)-7.10.075442121(3)2242243322化简求值8xy 3x5x2 3xy 2x,其中 x=1,y=12(3)2 231122231 2(10.5)3(2)3(11634)(48)2x27(3x7)21.5x80%x(x22)75%3115331933x12x 15x 13614143342113(34)4 30.8(2)
11、32(2)3(1)6(3)3(2)235163x 7 144xx1 24 43232x323x132先化简,再求值3x(2x x1)2(3xx),其中x 315.2513(14.75)(0.125)11222213573()46122231328(3)0(5)236(2)(4)2245x 2(x 1)3x(y x)(5x 2y)3x 4 7x 83 x223(x 4)-14-(-2)35+0.25(-12)2-425 5(-4)3122844x(7 8x)3(x 2)x x 12 2x 23253114252254122(110.5)32(2)231113(+)(48)32(2)3(1)6(3
12、)3(2)26641215(14)15(0.25)292324(-12)25(5.3)+(3.2)(2.5)(+4.8)48 6 25 4(81)9449(32)34(25)1225(14)(314)+(+8132)(54)(233456)(12)-2+|5-8|+24(-3)11231111317100 2004710012113101238333(1.25)81.25(8)-2(-56)+(+3.5)+(-16)242441.51.43.64.35.2131614)(-24)32-11825.71.82.3 (111131854432(4)33843(6)(1318);(10 x36x25
13、x 4)(9x3 2x2 4x 2)15(7 5x)2x (53x)1 3y 13y 81324332(3)2|1012022|2138x 3x (7x 2)42x 156x 181x0.180.03x0.50.021 32312(8)(11)(6)577231 3412 243136(2)22(6)x (2153)6(3)2(213)(14)12838 4.5295814162322x1 14.5-3|-19|3.61122 22 421 3 2 2 2223352210.8 2224(3)(9)8(5)637+45(9)32(32)(0.1)2 3(2)(1)()33423313()245
14、32221|-3|(0.25)()632112|33|(3)3 23321322 2(-1)(1.2)0.4 )492220.25 2 4 1 331325221222 22 10 31.2 0.33 1 34323212 0.5 2 8 232 4 2-7+4-34-(-2)-3(-1)(-5)(-(-2)-(-1)(2333239)(-)525111311-)-1 25(-25)256234241(-2)0.5-(-2.24)(-2)-12231712 4+-9(+)-0.8(-5)8(-16)+(+27)+(+9)+(一 24)(一 3)18+14(115)(345)36(1119618
15、);295一 5)+(一 2)+(+9)一(一 8)9 40 25;(2)13(3)134 2133(2)3;3223(2)2 20 (14)(18)13111211 1(2)(2.75)(24)(+)642524-14-(-2)35+0.25(-31121)2525254224设A=2x+3x-x,B=4x+8x-2x+6,当x=323211时,求A-B的值22(5a 3b)(a b)(5a 3b),其中 a1,b122222221()9(3)510(5)5(3113)+(+8)(5)424(5.3)+(3.2)(2.5)(+4.8)15(1)15(0.25)49423(81)(32)29(
16、-12)4924424253(25)125(1)486 25 412(18)+(7)15(235)(12)34625 12x2 x16x2x2,其中x 332-2+|5-8|+24(-3)112311214123414771.51.43.64.35.2 2004100100121083919299913131323123499100(364)(-24)111(1.25)81.25(8)5111 -2-(-)+(+3.5)+(-)23825.71.82.31111324332(3)2|1012022|2138x 3x (7x 2)46681453432(4)33843(6)(1318);(10 x36x25x 4)(9x3 2x2 4x 2)15(7 5x)2x (53x)2x 15x 1x0.180.03x1 11y y 811680.50.0233