问题 解答题
用简便方法计算下面各题.
(80+8)×2538×10165×99+65
36×9938×29+3835×37+65×37.
答案

(80+8)×25,

=80×25+8×25,

=2000+200,

=2200;

38×101,

=38×(100+1),

=3800+38×1,

=3838;

65×99+65,

=65×(99+1),

=65×100,

=6500;

36×99,

=36×(100-1),

=36×100-36,

=3600-36,

=3564;

38×29+38,

=38×(29+1),

=38×30,

=1140;

35×37+65×37,

=37×(35+65),

=37×100,

=3700.

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