化简 (a²-ab+2b²)-2(b²-a²)
先化解:(a² -b² /a² -ab ) /a² +2ab+b² /
化简(a²-2ab+2b²)-(2a²-2ab-3ab²)
化简:(b²-a²)/(a²-2ab+b²)
2(a²+b²)(a+b)²-(a²-b²)²
先化简再求值:(2ab²\a+b)³÷(ab²\a²-b²)²
化简:5(a²b-3ab²)-2(2a²-7ab²)
化简代数式:[(a²+b²)/(a²-b²)÷2ab/(a-b)(a+b)&su
1-a-b/a+2a/a²-b²/a²+4ab+4b² 求化简 ,
5a²-3a²+3(a²-b²)-2(5a²+2b²)怎么合
例如:a²+b²-c²-4d²-2ab+4cd x²+2xy+y&su
先化简,再求值.先化简,再求值.-a²b+(3ab²-a²b)-2(2ab²-a
2(a²b+3ab²)-3(a²b-1)-2a²b-2