… 平方差公式填空题 1.(x4)(4x)22. 2.(ab1)(ab1)( )-( ) . 223.(8m6n)(8m6n)______________. 4.(abab)()_______________ . 43435.(ab)(ab)(a2b2)_______________ .6.(xy2)(xy2)_______________ . 7.(x3y)( )=9y2x2 . 8.( )(a1)1a2 . 9.(3am)(4bn)16b29a2 ,则m_______,n________. 10.1.010.99________. . 用平方差公式计算: | (1)(2ab)(b2a) (2)(xny)(xny) ;(3)(a3)(a29)(a3);(4)(xy)(xy) 1313(5)(3ab2)(3ab2);(6)(4b3a5c)(3a4b5c);(7)8892 (8)2524计算(1)(x)(x2 (3)(a2b3c)(a2b3c) ; 176 . 745164)(x) ; 255 (2)(3a2b)(6a5b)(2b3a)(5b6a) ; (4)11(2x1)(2x1)(4x21)(x4); 1616 完全平方公式 填空题 1.(a+2b)2=a2+_______+4b2. 2.(3a-5)2=9a2+25-_______. 3.(2x-___)2=____-4xy+y2 4.(3m2+____)2=____+12m2n+____. 5.x2-xy+_____=(x-____)2. 6.49a2-____+81b2=(____+9b)2. 7.(-2m-3n)=______. 8.(211s+t2)2=_________. 349.4a2+4a+3=(2a+1)2+_____. 10.(a-b)2=(a+b)2-____. 用简便方法计算: (1)972; (2)20022; (3)992-98×100; (4)49×51-2499. 求值: (1)已知a+b=7,ab=10,求a+b,(a-b)的值.(2)已知2a-b=5,ab=222322,求4a+b-1的值 2 (3)已知(a+b)2=9,(a-b)2=5,求a2+b2,ab的值. a2b2(4).已知 (ab)16,ab4,求与(ab)2的值。 32 本文来源:https://www.wddqw.com/doc/901eed765222aaea998fcc22bcd126fff6055d09.html