方程组2x+y=15和x+2y+18
1.方程组x+y+2=18
解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1
已知方程组2X+Y=6和X-3Y=1不解方程组,求7Y(X-3Y)^2-(3Y-X)^3
解方程组:{x+|3x-y|+3y=15 2x+y=6
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
解方程组x:y=2:3和5x+3y=38 3y+x/y=8和9y-2x/y=9
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:2(x+y)-3(x-y)=34(x+y)+3x=15+3y.
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16
解二元一次方程组 2x+y=15 x+2y=18