方程组1.5x+y=6.5,3x-2y=5

方程组x-2y=8,3x-4y=5,x=?,y=? 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 换元法解方程组3/x+y+2/x-y=17/5 2/x+y-5/x-y=1 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 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{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5) 10/x+y+3/x-y=-5 15/x+y-2/x-y=-1（用换元法解此方程组）