乘法公式 1、平方差公式 一、填空题 ⑴ (b + a)(b-a) = _______________, (x-2) (x + 2) = _________________; 22⑵ (3a + b) (3a-b) =________________, (2x-3) (-2x-3) = ______________________; ⑶ (23121a)(a)________________,(________3b)(______3b)4a29b2 2322⑷ (x + y) (-x + y) = ______________, (-7m-11n) (11n-7m) = ____________________; ⑸ (2yx)(x2y)_____________,(a2)(a4)(a2)_____________________; 2、计算题 (m35n)(5nm3) (0.2x2y)(2y0.2x) (1xy)(xy1) (2x3y1)(2x3y1) 3、⑴下列可以用平方差公式计算的是( ) A、(x-y) (x + y) B、(x-y) (y-x) C、(x-y)(-y + x) D、(x-y)(-x + y) ⑵下列各式中,运算结果是9a16b的是( ) A、(3a4b)(3a4b) B、(4b3a)(4b3a) C、(4b3a)(4b3a) D、(3a2b)(3a8b) ⑶若(7x5y)(________)49x25y,括号内应填代数式( ) A、7x5y B、7x5y C、7x5y D、7x5y ⑷(3a)(3a)等于( ) A、9a222222422212212211921921444 B、81a C、81aa D、81aa 4162162164、计算题 ⑴ x (9x-5)-(3x + 1) (3x-1) ⑵ (a + b-c) (a-b + c) ⑶(3a2b)(3a2b)(9a4b) ⑷ (2x-1) (2x + 1)-2(x-2) (x + 2) 4、解不等式(y2)(3y)(y3)1 2222、完全平方公式 一、填空题 ⑴ (x + y)2=_________________,(x-y)2=______________________; ⑵(3ab)2___________________,(2ab)2______________________ ⑶(x1)2x2________124 ⑷ (3x + ________)2=__________+ 12x + ____________; ⑸ (ab)2(ab)2____________,(x2y)2_________________________; ⑹ (x2-2)2-(x2 + 2)2 = _________________________; 二、计算题 ⑴(2x332y)2 ⑵(2ab)2(b2a)2 ⑶(m1)(m1)(m21) ⑷ (2mn)2(2mn)2 ⑸(2x3)2(3x2)2 ⑹(x2y3z)2 7、已知x + y = a , xy = b ,求(x-y) 2 ,x 2 + y 2 ,x 2-xy + y 2的值 8、已知x(x1)(x2y)3,求x2y22xy的值 一、判断题 ⑴(2x3y)24x26xy9y2 ( ) ⑵ (3a2 + 2b )2 = 9a4 + 4b2 ( )⑶(0.2m2mn)20.04m40.6m3nm2n2 ( ) ⑷ (-a + b) (a-b) = -(a-b) (a-b) = -a 2-2ab + b2 ( ) 二、选择题 ⑴(m2n)2的运算结果是 ( ) A、m24mn4n2 B、m24mn4n2 C、m24mn4n2 D、m22mn4n2 ⑵运算结果为12x24x4的是 ( ) A、(1x2)2 B、(1x2)2 C、(1x2)2 D、(1x)2 本文来源:https://www.wddqw.com/doc/045f4fdf53e79b89680203d8ce2f0066f533643e.html