说明等式[(a-b)^2+(a+b)^2]^2-[(a-b)^2-(a+b)^2]^2=4(a-b)^2(a+b)^2成
计算:((a+b)(a-b)-(a-b)^2+2b(a-b))/4(a-b)
a-b+2b²/a+b
化简求值(a-b)/(a+b)+(a+b)/(a-b)-(2a*a-2b*b)/(a*a+b*b)其中a=-2,b=0.
化简:{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)]
化简(2a-b/a+b-b/a-b)除以a-2b/a +b
计算·[(2a+-b)/(a+b)-b/(a+b)]/(a-2b)/(a+b)
化简(2a-b/a+b-b/a-b)除以a-2b/a+b
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
计算a^2-b^2/a+b-4a(a-b)+b^2/2a-b
若a/b=2 则a*a-ab+b*b/a*a+b*b等于?
若正整数a,b使等式a+(a+b)(a+b-1)/2=2009,那么a=?,b=?
(a/a-b-a/a+b)(a+b)(a-b)/2b