作业帮[（a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a其中 a=-1,b=2
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[（a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a其中 a=-1,b=2
[（a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a
其中 a=-1,b=2
[（a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a其中 a=-1,b=2
[(a+2b)(a-2b)-(2a-b)^2+(3a-b)(3a-5b)]÷2a
=(a²-4b²-4a²+4ab-b²+9a²-18ab+5b²)÷(2a)
=(6a²-14ab)÷(2a)
=3a-7b
已知a=-1,b=2,那么：
原式=3a-7b=-3-14=-17
-2a(a+b)+b(a+b)
(a+2b)(a-2b)+(a-b)(a+b)-2(a-3b)(a-b)
5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b)
-a-b+2b^2/a+b
化简：|a+b|+|b-a|+|2b|
|a+b|-|b-a|+|2b|化简哦!
a-b+2b²/a+b
通分a-b,2b^/a+b
化简(2a-b/a+b-b/a-b)除以a-2b/a+b
计算：((a+b)(a-b)-(a-b)^2+2b(a-b))/4(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)]}÷[(a-2b)/(a+b)]
计算·[(2a+-b)/(a+b)-b/(a+b)]/(a-2b)/(a+b)
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
(2a-3b)[(a+b)-b(a-3b)]
化简：a-[b-2a-(a-b)]
化简（2a-b/a+b-b/a-b）÷a-2a/a-b