“x/3+y/4=54/60① x/5+y/4=42/60②”怎样解?
3x+2y=9 5x-4y=4 的方程组怎样解?
{3x+4y=5;-7x+9y=-5/2 怎样解
已知X+Y=-4,怎样求二分之一X+Y-4X-Y+3X+Y-二分之三X+Y+X-Y的值
解二元一次方程.①y=2x-3 3x+2y=8 ②y=x+2 6x+5y=-1 ③3x+5y=11 x+4y=15
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
解方程组:①3x-7y=1,5x-4y=17②23x+17y=63,17x+23y=57
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组
解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62
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)=12
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快