10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
用换元法解方程组:﹛(x+y)分之10+(x-y)分之3=-5 ﹛(x+y) 分之15 -(x-y) 分之2=-1
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(1)2x-3y=10,-4x+y=5 (2)3x-2y=15,5x-4y=23
2x=5(x+y) 3x-10(x+y)=2 用代入法解此方程组
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16
解方程组:(x+3)(y-2)=(x-3)(y+10),(x+1)(y+3)=(x-2)(y+12)
解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5)
换元法解方程组3/x+y+2/x-y=17/5 2/x+y-5/x-y=1
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解方程组 x+y分之10+x-y分之3=-5 x+y分之15-x-y分之2=-1
用代入法解此方程组:(x+y)/2+(x-y)/3=6 4(x+y)-5(x-y)=2