2y+1.65+2.35=7
2y+1.65+2.35=7
(2y-3)(-y+4)=(y-2)(y-5)-3y(y-7/3)解方程
{2x+y/3-2y=0 2(2x+y)-5=7y
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
代数式4y² - 2y + 5 = 7,那么代数式2y² - y + 1
10y+2(7y-2)=5(4y+3)+3y怎么算
y-7-8y=2y-3-5y 咋写?
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知7/3*根号(9y)-y-2y*1/y=-2,求y的值
2y''+y'-y=0
1.5y+8y-6y=2y-3
化简求值:【(x+2y)的2次方-(x+y)(x-y)-7y的2次方】除以2y,其中x=-1,y=-2