已知aa/b^2 B.a/b^2>a/b>a C.a/b>a/b^2>a D.a/b>a>a/b^2
已知a《b《0《c,化简|a-b|+|a+b|-|c-a|+2|c-b|.
a-b+2b²/a+b
(a+b)/(a-b)+(a+b)/(a-b)(a-b)-(a+b)/(aa-bb)
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:((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)
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)
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/a-b-a/a+b)(a+b)(a-b)/2b
已知a,b,c是正数,求证 a^2(b)×b^(2b)×c^(2c)大于等于a^(a+b)×b^(a+c)×c^(a+b