7.69*101 0.25*39+0.25 简便运算

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7.69*101 0.25*39+0.25 简便运算
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7.69*101 0.25*39+0.25 简便运算
7.69*101 0.25*39+0.25 简便运算

7.69*101 0.25*39+0.25 简便运算
7.69*101
=7.69*(100+1)
=7.69*100+7.69*1
=769+7.69
=776.69
0.25*39+0.25
=0.25*(39+1)
=0.25*40
=10

7.69*101
=7.69×(100+1)
=7.69×100+7.69×1
=769+7.69
=776.69
0.25*39+0.25
=0.25×(39+1)
=0.25×40
=10