化简|a-1|-|b-a|
化简a/a-b+b/a-b+1
化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b)
化简(2a+b)^2-2(a-b)(2a-b)-1/2(2a-b)
(a-b)(-a-b)化简?
B=-2 A=1化简:|A|-A=( )|A+B|=( )|A|+|B|=( )|B-A|=( )
(1) 化简 (x-c)/(x-a)(x-b)+(b-c)/(a-b)(x-b)+(b-c)/(b-a)(x-a)
化简(a-b)²/a²b² *(-a/b-a)³ ÷1/a²-b
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
化简(2a-b/a+b-b/a-b)除以a-2b/a+b
帮帮我忙: 9.化简1/(a+b)+1/(a-b)-(a-b)/(a^2+ab+b^2)-(a+b)/(a^2-ab+b
已知a小于0,b大于0,且|a|大于|b|,化简|a+b|+|a-b|-|-a-b|,并求a=-4,b=1的值