解方程组 1.x+y=2 3x-5y+18=0 2.3x=3y-2 3x-2y=2 3.6x+5y=5 3x+4y+5=
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+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
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 1.x+y=2 3x-5y+18=0 2.3x=3y-2 3x-2y=2 3.6x+5y=5 3x+4y+5=
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
x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组
解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5)