2(x-3/1) +|y+1|=0,求6x y-2(x y-2xy-2x )-xy的值
问题描述:
2(x-3/1) +|y+1|=0,求6x y-2(x y-2xy-2x )-xy的值
2(x-3/1)²+|y+1|=0,求6x²y-2(x²y-2xy-2x²)-xy的值
答
2(x-3/1)²=0 Iy+1 I=0(x-3/1)²=0 Y+1=0x-3/1=0 Y=-1x=36x²y-2(x²y-2xy-2x²)-xy=6×3²×(-1)-2【3²×(-1)-2×3×(-1)-2×3²】-3×(-1)=-54-2【-9+6-18】+3=-54+4...