(4a+5b)(5b-4a)-(-4a+5b)(-5b+4a)
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(4a+5b)(5b-4a)-(-4a+5b)(-5b+4a)
(4a+5b)(5b-4a)-(-4a+5b)(-5b+4a)
=(4a+5b)(5b-4a)+(-4a+5b)(5b-4a)
=(4a+5b-4a+5b)(5b-4a)
=10b(5b-4a)
再问: 还有一题= =麻烦了…… 已知a+b=2,ab=-二分之一 求1:(a-b)^2 2:(a^2-1)(b^2-1)
再答: (a-b)^2 =(a+b)^2-4ab =4+2 =6 (a^2-1)(b^2-1) =(ab)^2-(a^2+b^2)+1 =1/4-(a+b)^2+2ab+1 =1/4-4-1+1 =-15/4
=(4a+5b)(5b-4a)+(-4a+5b)(5b-4a)
=(4a+5b-4a+5b)(5b-4a)
=10b(5b-4a)
再问: 还有一题= =麻烦了…… 已知a+b=2,ab=-二分之一 求1:(a-b)^2 2:(a^2-1)(b^2-1)
再答: (a-b)^2 =(a+b)^2-4ab =4+2 =6 (a^2-1)(b^2-1) =(ab)^2-(a^2+b^2)+1 =1/4-(a+b)^2+2ab+1 =1/4-4-1+1 =-15/4
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