解方程组﹛x+y=180,x/12+y/8=20

解方程组﹛x+y=180,x/12+y/8=20 解方程组 x+2y=1.5,12(x+y)+15y=20 解方程组 x+y+z=-7 x-y=12 x+y-z=6 解方程组x+y+根号下x+y=12 x+xy+y=23 解方程组x+y+√(x+y)=20;x²+y²=136 已知方程组4x+2y=1,20x+8y,求x,y 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组:﹛2x-7y=8,3x-8y=10 解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18 解方程组:(x+3)(y-2)=(x-3)(y+10),(x+1)(y+3)=(x-2)(y+12) 解方程组：x+y/2+x-y/3=6 4(x+y)-5(x-y)=12