题目内容

【题目】脱式计算。(能简算的要简算)

9.9×9+9.9

0.63×101

2.73×0.5×6

(12.5+1.1)×0.8

3.7×8.3+0.83×63

【答案】99;63.63;8.19;10.88;83

【解析】

9.9×9+9.9

=9.9×(9+1)

=99

0.63×101

=0.63×(100+1)

=0.63×100+0.63×1

=63.63

2.73×0.5×6

=2.73×(0.5×6)

=8.19

(12.5+1.1)×0.8

=12.5×0.8+1.1×0.8

=10+0.88

=10.88

3.7×8.3+0.83×63

=3.7×8.3+6.3×8.3

=(3.7+6.3)×8.3

=10×8.3

=83

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