问题 解答题
用简便方法计算.
(1)31.4×0.18+31.4×0.82
(2)
1
4
+5.9+4.1+0.75.
答案

(1)31.4×0.18+31.4×0.82,

=31.4×(0.18+0.82),

=31.4×1,

=31.4;

(2)

1
4
+5.9+4.1+0.75,

=(5.9+4.1)+(0.25+0.75),

=10+1,

=11.

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