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
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
由题意得2(x-3/1)²=0 x=3
|y+1|=0 y=-1
所以6x²y-2(x²y-2xy-2x²)-xy=-9
答
1。哪有3/1这种用法,所以题目错误,至少不规范。
2。有多组解。
3。当y=-1,x=3时,值-9。
4。我觉得原来错误处应该是1/3,那么值该是-1。(虽有多组)
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...