问题 解答题
用简便方法计算.(写出简算过程)
(1)
5
12
+
3
8
+
7
12
+
5
8
(2)70.2×0.08+9.2×7.02
答案

(1)

5
12
+
3
8
+
7
12
+
5
8

=(

5
12
+
7
12
)+(
3
8
+
5
8
),

=1+1,

=2;

(2)70.2×0.08+9.2×7.02,

=7.02×0.8+9.2×7.02,

=7.02×(0.8+9.2),

=7.02×10,

=70.2.

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