x+2y=42 10x+8y+5y=315怎么解(不能只有答案)
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
解方程组:1、6(x-y)-2(x-y)=14 2、3(x-y)+(x+y)+5 怎么解
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
解方程组x:y=2:3和5x+3y=38 3y+x/y=8和9y-2x/y=9
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
怎么解这个二元一次方程组 (1)x+3y=8 5x-3y=4 (2)2x+5y=5 3x-5y=10