解方程;(1) 3(x-2)+1=x-(2x-1) (2)4(y+1)-5(y-3)=6(y+1)-3(y-3).
用代入法解方程2(x-y)/3-(x+y)/4=-1① 6(x+y)-4(2x-y)=16②
不解方程2x+y=6,x-3y=1,求7y(x-3y)^2-2(3y-x)^3 的值
解方程(3x+2y)/4=x+1/3y=3(x-2)+y
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
解方程:(1)4x+7y=10 (2)x+y-z=0 6x-11y+28=0 x+2y-z=3 2x-3y+2z=5
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
解方程(3x+2y)/4=(2x+3y)/5=(x-1)/6
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
(x+y)-(x+y)平方 因式分解 解方程 2x²=3x (3x-1)² - 4=0 5x-15x
解方程:1){x-1=3(y-2)2(x-1)=5y-18; 2)2x+3y/4+2x-3y/3=7,2x+3y/3+2
解方程3(x-1)-4y=8,2(y-3)=2(x+1)-14 已知(x-y)/4=(2x+y)/5,且2x-3y=18