4x-3(20-x)=6x+7(x-12) 4(2y+3)=8(1-y)-5(y-2)解方程
(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)4x+7y=10 (2)x+y-z=0 6x-11y+28=0 x+2y-z=3 2x-3y+2z=5
用代入法解方程2(x-y)/3-(x+y)/4=-1① 6(x+y)-4(2x-y)=16②
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
解方程(3x+2y)/4=x+1/3y=3(x-2)+y
解方程(3x+2y)/4=(2x+3y)/5=(x-1)/6
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
不解方程2x+y=6,x-3y=1,求7y(x-3y)^2-2(3y-x)^3 的值
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
(1)﹛2x-y=5 (2) 4x-y=1 (3)5x+y=2 7x-3y=20 y=2x+3 x-3y=4 (4)3x
(Y-2)/3=X(Y-4)/5=X(Y-6)/7=X(Y-8)/9=XY/11=X求Y和X是多少?方程.我没学过.我自