问题 解答题
简便计算
6.5-3.73+3.5-1.27
7×5.3+0.7×47
46×
7
45
答案

(1)6.5-3.73+3.5-1.27

=6.5+3.5-(3.73+1.27),

=10-5,

=5;

(2)7×5.3+0.7×47

=7×5.3+7×4.7,

=7×(5.3+4.7),

=7×10,

=70;

(3)46×

7
45

=(45+1)×

7
45

=45×

7
45
+1×
7
45

=7+

7
45

=7

7
45

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