Y=3+2X,则2(Y-2X)^3-4(2X-Y)^2+6X-3Y=?
1个回答
y=3+2x则y-2x=3
原式=2(y-2x)^3+4(y-2x))^2-3(y-2x)
=2X3^3+4X3^2-3X3
=54+36-9
=81
相关问题
(x^4y+6x^3y^2-x^2y^2)/(3x^2y)=?
(1)(x-2y)^6/(2y-x)^3 (2)(-x-y)^6/(x+y)^3 (3)(x-2y)^3*(x-2y)^
因式分解 (X+3Y)2+(2X+6Y)(3Y-4X)+(4X-3Y)2
若x+2y=1 2x-3y=-1,则2x+4y-2/3 + 6x-9y/2=
(9x3y4-6x4y3+3x2y3)÷______=-3x2y2+2x3y-xy.
设[2x−y/x+y=3,其中x,y≠0,则(2x−3y)3−(3x−2y)3(4x+2y)3−(x−7y)3]=(
若x+2y=1,2x-3y=2,则2x+4y-6/2+6x-9y/4=?
求值(2x+y)(2x-y)+3(2x-y)^2+(-3x)(3x-4y)+(4x^5-6x^3)/2(-x)^3
【4】(-2x+3y)(-2x-3y) 【5】(-1/4x-2y)(-1/4x+2y) 【6】x^2+(y-x)(y+x
x-3y=2 -2x+6y=5 和 x-3y=2 -2x+6y=-4