1.(3xy²)·(-2xy)2.(2a+1)²-(2a+1)(-1+2a)3.(2x+y+1)(2
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-
去括号题,1.已知A=5x的二次方y-3xy的二次方+4xy,B=7xy的二次方-2xy+x的二次方y,求:(1)A-2
分解因式:xy²-2xy+2y-4 化简:(1-3a)²-2(1-3a)
已知(2a)^x=a,log3a2a=y(3a为底数,2a为真数),求证:2^(1-xy)=3^(y-xy).
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
1.(3xy²)·(-2xy)2.(2a+1)²-(2a+1)(-1+2a)3.(2x+y+1)(2
已知(x-2)²+|y+1| =0,A=5x²+3xy-4y²,B=x²+2xy
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
(1)(-2x²y³)²·(xy)³ (2)(2a+3b)(2a-b)
(1)、已知A=3x^2 y-2xy^2+4xy,B=5xy^2-3xy+x^2 y,且A+B+2C=0,求C.
分解因式:(X+Y)*(X+Y+2XY)+(XY+1)*(XY-1)