解方程:x/v-x/(y+8)=27/60,x/(y-4)-x/y=18/60
解方程{x+y=60 2x=4y+x
解方程x*x+xy=y+y*y
解方程 2x+3y=21 5x+4y=59 12x+5y=99 2x+3y=18 2x+3y=24 8x+5y=51 5
解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62
解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3
求方程x+2y-3x=4,3x-2y+x=6,3x+2y-5x=8的解
80y+100y=x+60(y+10)+100(y+10) 这个方程怎么解?
解方程 {x+y=20 x-y=12
已知实数x,y满足方程x*x+y*y-4x+1=0.求y-x的最大值
解方程{2x+y=2、-x+y-5
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
解方程 1.y=3x+2 y+3x=8 2.2x=3y 4x-3y=4 3.3x+2y=3 2y=3x-1