问题 解答题
用你喜欢的方法计算.(写出必要的过程)
10.7-0.64-0.3621÷
8
3
+21×
5
8
0.25×32×125
1
2
÷[1-(
1
3
+
5
9
)].
答案

(1)10.7-0.64-0.36,

=10.7-(0.64+0.36),

=10.7-1,

=9.7;

(2)21÷

8
3
+21×
5
8

=21×

3
8
+21×
5
8

=21×(

3
8
+
5
8
),

=21×1,

=21;

(3)0.25×32×125,

=(0.25×4)×(8×125),

=1×1000,

=1000;

(4)

1
2
÷[1-(
1
3
+
5
9
)],

=

1
2
÷[1-
8
9
],

=

1
2
÷
1
9

=

9
2

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