问题
解答题
计算: (1)(
(2)(
|
答案
(1)(
)5•(-x2 -y
)•(y2 x
)7=-1 xy
•x 10 y 5
=-1 xy
;x 9 y 6
(2)(
)-3÷(m4n-4 m-1n
)5=m-2n2 mn-1
×m-12n 12 m 3n -3
=m-2n2•m2n-2=1.m 5n -5 m -10n 10
计算: (1)(
(2)(
|
(1)(
)5•(-x2 -y
)•(y2 x
)7=-1 xy
•x 10 y 5
=-1 xy
;x 9 y 6
(2)(
)-3÷(m4n-4 m-1n
)5=m-2n2 mn-1
×m-12n 12 m 3n -3
=m-2n2•m2n-2=1.m 5n -5 m -10n 10