整式的乘除提高练习题一、填空a1.若 2a +3b=3,则 9·27b的值为_____________. 2.若 x3=-8 a 9b6,则 x=______________.3.计算:[(m2) 3·(-m4) 3]÷(m·m2) 2÷m12__________.4.用科学记数法表示 0.000 507,应记作___________.5.a2+b2+________=(a+b)2a2+b2+_______=(a-b)2(a-b)2+______=(a+b)26.计算(a-b)(a+b)(a +b )(a -b )27.设4x mx 121 是一个完全平方式,则 m =_______。22448.已知 x 11 5 ,那么 x 2 2 =_______。xx9.已知 2a=5,2b=10,2c=50,那么 a、b、c 之间满足的等量关系是___________.二.计算:(本题 8 分)(1)1(3))(2x2y-3xy2)-(6x2y-3xy2)(4)(-1121(5)(45a3-a2b+3a)÷(-a)(6)(x2y-6xy)·(xy)633234 36ax y )÷(-ax2y2)·8a2y2520121 2 23.14 (2) 2x3y 2xy 2x3y 2x 202 3(7)(x-2)(x+2)-(x+1)(x-3)(8)(1-3y)(1+3y)(1+9y2)1(9)(ab+1)2-(ab-1)2(10)(998)2(11)197×203(12) a 3÷a ·a 2; (13)(-2a )3-(-a )·(3a )2(14)t8÷(t2·t5); (15)x5·x3-x7·x+x2·x6+x4·x4.(16)0.252008×(-4)2009 (17)(a -b) 2·(a -b) 10·(b-a );(18)2(a 4) 3+(a 3) 2·(a 2) 3+a 2a 10 (19)x3n+4÷(-xn+12) 2÷xn.12102 2(20)(2) ( ) ( ) [(2) ];222(21)(x ) (x ) x (x ) (x)23 22 362 22(22) (9)3 ( )3 ( )3;(23) (1(24) 22 ( )1 1 ( 3)0(25)[5xy2(x2-3xy)+(3x2y2)3]÷(5xy)232313519993)(2 )1998 .135(26)(2m+1)(2m-1)—m·(3m-2) (27)10002-998×1002 (简便运算)(28) (-2y3)2+(-4y2)3-(-2y)2·(-3y2)2 (29)(3y+2)(y-4)-3(y-2)(y-3)三(本题 8 分)先化简,再求值:(1)2a b a 1 ba 1 b a 1 ,其中a 221 ,b 2 。2(2) 2(a 3)(a 3) a(a 6) 6 ,其中 a3 12 .(3)(x+4)(x-2)(x-4),其中 x=-1.(4)[(xy+2)(xy-2)-2x2y2+4],其中 x=10,y=-11(5)已知 x , y ,求代数式(2x 3y) 2 (2...