试题:
用简便方法计算.
(1)(-
1
4
4005×162003=______;
(2)318×(-
1
9
8=______;
(3)(0.5×3
2
3
199•(-2×
3
11
200=______;
(4)0.259×220×259×643=______.
有理数的乘方 2016-05-17

答案:

我来补答
(1)(-
1
4
4005×162003
=(-
1
4
4005×(422003
=(-
1
4
4005×44006
=(-
1
4
4005×44005×4
=[(-
1
4
)×4]4005×4
=(-1)×4
=-4;
(2)318×(-
1
9
8
=318×[-(
1
3
2]8
=318×(
1
3
16
=316+2×(
1
3
16
=(3×
1
3
16×32
=9;
(3)(0.5×3
2
3
199•(-2×
3
11
200
=(0.5×
11
3
199•(-2×
3
11
200
=[0.5×
11
3
×(-2)×
3
11
]199×(-2×
3
11

=
6
11

(4)0.259×220×259×643
=0.259×643×220×259
=0.259×(433×410×259
=(0.25×4)9×(4×25)9×4
=4×1018
 
 
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