a^2+5(a-b)(a+b)-(3a-2b)^2+9b^2,化简

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 化简 |a+b|-|3a-2b| 化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b) 因式分解（a-b)-3a+3b (a+b)(a-b)-2b(3a-5b) a-b+2b²/a+b A=B+B+B+B+B+B+B+B+B+B+B+B+B+B+B A-B×3=C C+2×7+2=1 [（a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a [(a-2b)²-(a+3b)(a-2b)]/(-5b)化简. 计算：((a+b)(a-b)-(a-b)^2+2b(a-b))/4(a-b) 计算·[(2a+-b)/(a+b)-b/(a+b)]/(a-2b)/(a+b)