数学题化简2-【2(x+3y)-3(x-2y)】
问个数学题,(2x+3y)^2-(2x+y)(2x-y)
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
(x-y)(2x+3y)-3(x+2y)(x-2y)分解因式
化简求值:-8x2-5x(-x+3y)+(3x+2y)(x-y),其中x=2,y=-1.
数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y
数学题化简再求值(1/x-y+1/x+y)÷x^2 y^2/x^2-y^2,其中x=3,y=-√2
几道数学题1.解方程(二元一次方程组) (1)3x-y=5 (2)2x/3+3y/4=1/5 5y-1=3x+5 5x/
(2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0
数学题(x+y+3)(x^2+y^2+2xy-3x-3y+9)
数学题(2x+y):(x+2y)=2:3,x:y得多少
已知x和y满足x+3y+|3x-y|=19,2x+y=6,求x,y的值
12x²-3y² (2x+y)²-(x+2y)²