｛16X+Y=-8.75×4 X+16Y=-12.5×4

｛16X+Y=-8.75×4 X+16Y=-12.5×4 3分之2(X-Y)-4分之X+Y=-1,6(X+Y)-4(2X-Y)=16 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 若x*x+y*y-4x+16y+13=0 ,则x=____ y=____ 4x-(2x+y+16)/2=-6y 2x+3y=7-x-2y 解方程组 10（x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16 已知集合A={（x,y)| (y-3)/ (x-1)=2,x,y∈R},B={（x,y)| 4x+ay=16,x,y∈ x*x+4y*y+2x*x-4y+2=0求根号下5x*x+16y*y的值快啊 16（x-y）（x-y）-25（x+y）（x+y)=?x的4次方+4乘y的4次方=?因式分解, 5(X-3Y)-6=2X+1,3(X+Y)=4(2X-Y)+16 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 （5x+3y)(3y-5x)-(4x-y)(4y+x)=