2y+1.65+2.35=7

2y+1.65+2.35=7 (y-4)(3y+2)-(3y-7)(2y+1),其中y=4/3 2(y-4)(3y+2)-5(-3y+7)(y+1),其中y=-1 y的平方+2y+7=8,y=? 解方程 4y-2=y-6+7y 5(y-2)-7(y+3)=11(y+4) （2y-3)(-y+4)=(y-2)(y-5)-3y(y-7/3)解方程 Y(2Y+7)=4 .. 2y-1=5y+7 2y+1=5y+7 7y-6=5-2y则7y+6=17-2y对吗? {2x+y/3-2y=0 2(2x+y)-5=7y 若 4y^2-2y+5=7 则 2y^2-y+1=? x+2y=2x+y+1=7x-y 求：2x-y? 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 {x+2y+2=0 {7y-4y=-41 求X和Y x^2+y^2=15,x+y=7,x＞y,求x-y 7y(x-3y)-2(3y-x)=0 .x=?,y=?