(y/3)-1=(-5+7y)/3
解方程:3y^2-(2y+1)(y-1)=(y-5)(y+1)
解方程3y^2-(2y+1)(y-2)=(y-5)(y-1)
(2y-3)(-y+4)=(y-2)(y-5)-3y(y-7/3)解方程
(y/3)-1=(-5+7y)/3
x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9
(3y-1)/4-1=(5y-7)/6 9y-3-3=10y-14 9y-10y=-14+3+3 -y=-8 y=8
解方程:4(2y+3)=8(1-y)-5(y-2) 解8y+3=8-y-5y+2 14y=7 所以y=1/2 错在:原因
7x-3y/5=5x-y/3-x+y/2 x-1/5=y+1/3
{ x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3
已知:x-y=1,x+y=-7,求代数式3(x+y)+20(x-y)-5的值
10y+2(7y-2)=5(4y+3)+3y怎么算
{2x+y/3-2y=0 2(2x+y)-5=7y