计算:①-5(a²-2)-2(3a²+5) ②-2(ab-3a²)-[2b²-(
计算 (a²-2ab+b²-a+b)÷(a-b) (a+b)²÷(a-b)
计算:(a²-b²)/(a+b)+(a²-2ab+b²)/(a-b)
已知A=3a²-3ab+b²,B=3a²-2ab,C=a²-ab,试计算A-2B
计算:a/b(a-b)-b/a(a-b);(1/a+1/b)÷a²+2ab+b²/a+b.
计算:(4ab³+6a³b-8a³b²)÷2ab-(a+b)(3a-2b)
计算:①-5(a²-2)-2(3a²+5) ②-2(ab-3a²)-[2b²-(
计算:-10ab(3/2ab²-1/5a²b);(-2a)²(3ab²-5ab&
计算:2/3a²-1/2ab+3/4a²+ab-b²
计算(—3ab)(2a²—1/3ab+5b²)
计算3a²b²÷a²+b×(a²b-3ab-5a²b)
计算(2A²+3AB+B²)-2分之1A²+3AB-B²
计算:(a/a-b-a²/a²-2ab+b²)÷(a/a+b-a²/a²