解方程组 5x+2y=11① y=7.3x②
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
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
解方程组{5x+2y=6 ① 2x+5y=8 ②
解方程组(x/2-y/5=4①,x/7-y/15=3②)
解方程组x+y/3=x-y/4 2x+3y=11
解二元一次方程组 3x-2y=11① 4x-5y=3②
1.关于x,y的二元一次方程组 x+y=5k① x-y=-5/k+b②的解也是二元一次方程组 2x+y=28③ y-2x
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:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2()