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1、111.51.44.35.23.663211 1 0.5 2.57.3 2.5(2.4)2.5(1.7)362412533510.22|5|11523323112 2 9+5(6)(4)2(8)4241112x 10.33 246x 312332x 123x)15(1 15(1423941111(81)(32)48()494366123542(2m2)4m2482(2xy)(2xy)2 (143222xy)(12x y)(x y)33(3x2y)(3x2y)(x2y)(3x2y)3x先化简后求值:m(m3)(m3)(m3),其中 m414323224(3)13()|4|3(2)(1)(2)25
2、42x-19=7x+312223x 15x7=1462化简(求值)2(x y xy)2(x y x)2xy 2y的值,其中x 2,y 212116()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 b23-2-(-3)(-1)-(-1)-1-()2345122-(-3)332211(22)3(11)(2)(3)()2 6 293232(x1)48x31/2x111148()186 2641231()32333-(-6)-1-()(-1212)2-(-3)32-3(-2)-(-1)4()32221|-3|
3、(0.25)()6321111(2)(3)24837111322 3(2)250()(6)2(7)291263先化简,再求值:3(x y)2(x y)2,其中x 1,y.41772(6)2化简:(4a23a)(2a2 a 1)(2 a2 4a)483先化简,再求值:2x15x12(x2)2x113611312x 2x y2 x y2,其中 x=2,y=。232331314 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+|1|23231()(
4、24)317315()(60 60 60)346521277716()2(1.5)5364(2.5)(0.1)22(3)3(3)(4)1.51.44.35.23.611x ,y 45先化简,再求值:(2x3y)(2x2y)1,其中22 131351324 5 42241 24 5248648412x23x2y2343x2x23x2y2x2yxyx22x241163211 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)5131 5 24424348()1636(
5、6)72(8)514223225 3x2(x3y)23(x2 y)4(2 x23y)12(2312)(5)2121112(4316 32)(23)4.5(5)(11225 0.7)5512 (2)0 147 24(29)(2)(32 23)|5|11223153 05.3(23)31(3)2 3221 3232(0.2)252 3(1)6442113334221171 ()(1)3;()()()3 (3)(1)2232(3)2(32)(2 3)2 2 32;1+(2)+2351163448120095253 0.81216(15)215219;(23)(58)()9217(35)13(1)20
6、084028192431 2160232 43121522231216 2318 41212143232(2)3(4)262123333 5273213 2412化简:3(2x5)+6x(14)(16)(+6)解方程:5(83x)=x51(4)20.25(5)()382先化简,再求值:当x 123111x(2xy2)(xy2),其中x ,y 2323421,y 3时,求代数式3(x2 2xy)3x2 2y 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=4x32(x1)1222221,y=3.2x 1x 2
7、4 x362771(13 3)4828(1)32(2)3 32(7)4x 3(20 x)32x13 x 23x61x 13 2x136x74x-523(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 422112514117(2)()2()3|(5)9(15)(2.531)22425828当x 1,y 3时,求代数式3(x2 2xy)3x2
8、 2y 2(xy y)的值。21(2)32(4)103(4)2(132)24化简求值:5a 3a 2(2a 3)4a,其中a 22122 2 2020 (1414)(1818)1313 1 1.6 6()2 2(3 3)3 3(2 2)2 2 3 3x x3 3x x 1 15 5x x 3 32(3y y 1)7(y y 2)3 4 4 3 32 26 6(8)+10+2+(1)5+(6)+3+9+(4)+(7)(+(+(+11124+()+()+()35223(17)+59+(37)(+(+(4111112)+(3)+6+(2)(+3+(5)332442(+(+(7)+(+11)+(13)
9、+9333821192+(+9+(3)49+(+27+(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)3-2|-3|+(-6)(-3(-2x-5)+2x=9 2x-化简求值:2x+(-x+3xy+2y)-22222151)-|+|(-)812212x 1=-136121+y),其中 x=,y=3.220.4x0.90.030.02xx53354(-+-)(-7)0.50.032741431313121221(0.28-14+4)143422113530.713.5(-
10、32.5)-7.10.075442121(3)22422433化简求值8xy3x25x2 3xy2x2,其中 x=1,y=1(3)223133(11634)(48)2x27(3x7)280%x(x22)75%351331192122(11332(2)23x12x 135x 161414342133(314)4 30.8(2)3(2)(1)(3)3(2)65323612x1 23x7 144x4 43232x323x132先化简,再求值3x(2x x1)2(3 xx),其中x 313()()21122213573()46122233218(3)0(5)236(2)(4)2452x 2(x 1)3
11、x(y x)(5x 2y)3x 4 7x 83 x223(x 4)-14-(-2)35+(-122)-425 5(-4)3122844x(7 8x)3(x 2)x x 12 2x 23253114252 254122(1132(2)23113132(2)3(1)6(3)3(2)2(+)(48)615(14)15(292324(-12)25()+()()(+)48 6 25 46412(81)9449(32)34(25)1225(14)314)+(+8132)(54)(233456)(12)(-2+|5-8|+24(-3)11231111317100 2004710012113103813323
12、(1.25)81.25(8)-2(-56)+(+(-16)242441.51.43.64.35.2131614)(-24)32-11825.71.8 2.3 (3111118 54432(4)33843(6)(1318);(10 x36x25x 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)2 2(6)x(2153)6(3)2(213)(14)12838
13、4.5295814162322x 1 1|-19|1122 22 421 3 2 2 2223352210.8 2224(3)(9)8(5)637+45(9)32(32)(2 3(2)(1)()33423313()24532221|-3|(0.25)()632112|33|(3)3 2332131.2)20.42 )2(-1)(4920.2523224 1312232513212.20.3 312 22 1034323212 0.528232 4 2-7+4-34-(-2)-3(-1)(-5)(-(-2)-(-1)(2333239)(-)525111311-)-1 25(-25)2523642
14、41(-2)(-2)-1237112 4+-9(+)(-5)82(-16)+(+27)+(+9)+(一 24)(一 3)18+14(115)(345)36(1119618);95一 5)+(一 2)+(+9)一(一 8)940 25;(2)13(3)134 2133(2)3;322 3(2)2 20(14)(18)13211111 1(2)(2.75)(24)(+)524642-14-(-2)35+(-123112525 25)4224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(
15、)9(3)510(5)5(3113)+(+8)(5)()+()()(+)(81)9449(32)2925314(25)1225(4)12(18)+(7)1542415(14)15(2324(-12)48 6 25 4(233456)(12)25 12x2 x16x2x2,其中x 332-2+|5-8|+24(-3)11231121412341477 20041.51.43.64.35.2100100121083919299913131323123499100 (111)(-24)364(1.25)81.25(8)5111 -2-(-)+(+(-)23825.71.8 2.31111324332(3)2|1012022|2138x 3x (7x 2)46681453432(4)33843(6)(1318);(10 x36x25x 4)(9x3 2x2 4x 2)15(7 5x)2x (53x)1 12x 15x 11y y 813368x0.180.03x10.50.02
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