解方程组:x-y=20 (x+10)÷(y-10)=5
解方程组:x-y=20 (x+10)÷(y-10)=5
解方程组x+y=15 (x+15%x+y+10%y)=17
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: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)
解二元一次方程组 5x+10=10y 15x=20y+10
解方程组(1)2x-3y=10,-4x+y=5 (2)3x-2y=15,5x-4y=23
一次方程组x=y+3 (10y+x)+(10x+y)=99 怎么解
解方程组X+Y/2=3X-2Y=10+6X+Y/4
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
用加减法解方程组:{(x+y)/6+(x-y)/10=3 (x+y)/6+(y-x)/10=-1