用简便方法计算下面各题. (80+8)×25 38×101 65×99+65 36×99 38×29+38 35×37+?
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解题思路:根据乘法分配律,即:(a±b)×c=a×c±b×c,进行解答即可.
(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.
,1,用简便方法计算下面各题. (80+8)×25 38×101 65×99+65 36×99 38×29+38 35×37+65×37.
(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.
,1,用简便方法计算下面各题. (80+8)×25 38×101 65×99+65 36×99 38×29+38 35×37+65×37.
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