题目内容
已知:am=7,bn=
,则(-a3mbn)2(amb2n)3的值为( )
1 |
7 |
A.1 | B.-1 | C.7 | D.
|
(-a3mbn)2(amb2n)3
=(am)6(bn)2(am)3(bn)6
=(am)9(bn)8
=79×(
)8
=78×(
)8×7
=(7×
)8×7
=7.
故选:C.
=(am)6(bn)2(am)3(bn)6
=(am)9(bn)8
=79×(
1 |
7 |
=78×(
1 |
7 |
=(7×
1 |
7 |
=7.
故选:C.
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