问题 解答题

用简便方法计算.

(1)70.7-21.43-8.57

(2)9.87×7.37+2.63×9.87.

答案

(1)70.7-21.43-8.57

=70.7-(21.43+8.57)

=70.7-30

=40.7;

(2)9.87×7.37+2.63×9.87

=9.87×(7.37+2.63)

=9.87×10

=98.7.

单项选择题 B型题
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