Question

( a+b a-b ) 2 ? 2a-2b 3a+3b - a 2 a 2 - b 2 ÷ ..

( a+b a-b ) 2 ? 2a-2b 3a+3b - a 2 a 2 - b 2 ÷ a b

Answer 1

原式= (a+b) 2 (a-b ) 2 × 2(a-b) 3(a+b) - a 2 (a+b)(a-b) × b a = 2(a+b) 3(a-b) - ab (a+b)(a-b) = 2 (a+b) 2 -3ab 3(a+b)(a-b) = 2 a 2 +ab+2 b 2 3(a+b)(a-b) ． 故答案为 2 a 2 +ab+2 b 2 3(a+b)(a-b) ．