问题
解答题
jm2y-[6my-2(umy-2)-m2y]+1,其中m=-
|
答案
3x1y-[6xy-1(4xy-1)-x1y]+1,
=3x1y-[6xy-8xy+4-x1y]+1,
=3x1y-6xy+8xy-4+x1y+1,
=4x1y+1xy-3,
当x=-
时,原式=4×(-1 1
)1y+1×(-1 1
)y-31 1
=y-y-3
=-3.
jm2y-[6my-2(umy-2)-m2y]+1,其中m=-
|
3x1y-[6xy-1(4xy-1)-x1y]+1,
=3x1y-[6xy-8xy+4-x1y]+1,
=3x1y-6xy+8xy-4+x1y+1,
=4x1y+1xy-3,
当x=-
时,原式=4×(-1 1
)1y+1×(-1 1
)y-31 1
=y-y-3
=-3.