解方程:(1)3y-15=y-11 (2)0.2x-1.2=0.6+x (3)5x+1=20x-(7x-3)
(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
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
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x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
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
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
(1)﹛2x-y=5 (2) 4x-y=1 (3)5x+y=2 7x-3y=20 y=2x+3 x-3y=4 (4)3x
解方程(3x+2y)/4=(2x+3y)/5=(x-1)/6