问几道数学题,3(x²-y²)-4(2x²-3y²)怎么做?
问几道数学题,3(x²-y²)-4(2x²-3y²)怎么做?
[(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做?
初一数学题解答 已知(x+y-3)²+(x-y+4)²=0,求x²-y²的值
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
一道数学题:(2x-y)(2x+y)+(2x+y)²
x(x-y)-y(y-x)+(x-y)²因式分解
①(2x+y-3)²②(3x+2y-4)(3x+2y+4)这两道题怎么算?
数学题(2x-y-3)²是什么意思
(3x-y)²-2x(4x-5y)-(x+2y)²
(x+3y)²-(x+3y) 怎么因式分解?
y=-x²-2x+3怎么解
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y