解方程组:(1)2x-5y=19 (2)2x-3y-8=0 (3)2x+3y=5 3x+4y=2 5y-7x-5=0 3
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
方程组x-2y=8,3x-4y=5,x=?,y=?
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组
解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4
解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2
解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5)
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27