问题 解答题
计算下面各题,怎样简便就怎样算.
(1)(125+
7
32
)×8
(2)
19
4
×20%+
19
4
×
4
5
(3)25×32×125
(4)99×
1
100
(5)[
3
4
×(122-21-1)÷
1
100
]
(6)
1
27
÷
4
5
×
125
2
×
4
5
×270.
答案

(1)(125+

7
32
)×8,

=125×8+

7
32
×8,

=1000+1.75,

=1001.75;

(2)

19
4
×20%+
19
4
×
4
5

=

19
4
×(20%+
4
5
),

=

19
4
×1,

=

19
4

(3)25×32×125,

=25×(4×8)×125,

=(25×4)×(8×125),

=100×1000,

=100000;

(4)99×

1
100

=(100-1)×

1
100

=100×

1
100
-1×
1
100

=1-

1
100

=

99
100

(5)

3
4
×(122-21-1)÷
1
100

=

3
4
×100÷
1
100

=75÷

1
100

=7500;

(6)

1
27
÷
4
5
×
125
2
×
4
5
×270,

=

1
27
×
5
4
×
125
2
×
4
5
×270,

=125×5,

=625.

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