(1)(a/b)²÷(2a²/5b²)*a/5b (2)4x²-4xy+y
(1)16-(2a+3b)²(2)-36x²+12xy-y²(3)4x(a-b)-8y(b
因式分解2x²y-xy-3y (-a+b)+c²(a-b)
计算:(1)3a/4b乘16b/9a²,(2)12xy/5a÷8x²y,(3)(-3xy)÷2y
计算a-b/a+b*a四次方-a²b²/a²-ab (2)4x²-4xy+y
已知(x-2)²+|y+1| =0,A=5x²+3xy-4y²,B=x²+2xy
化简分式;(1)3xy/42x-3xy(2)a-b/a²-b²(3)x²+2xy+y
(1).设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X-
已知A=4x²-4xy+y²,B=x²+xy-5y²,求:⑴A-3B;⑵2A+B
(1)(-2x²y³)²·(xy)³ (2)(2a+3b)(2a-b)
1、计算(1)2/m+1/m (2)3b/xy-b/xy (3)(a/a+b)+b/a+b (4)(5x/2x-y)-x
化简(a-b)²÷(ax+by-ay-xy)-(a-b)÷(x-y)
求大手啊6xy[x^2(5x+3)-3x^2(-4y)] 还有 [(a+b)(a-b)-(a-b)^2]除以4b 还有[