题目内容

【题目】下列各题怎样简便就怎样算。

3.6×2.5×0.4 1.81×2.3-2.3 0.4×25+3.65

3.5×102 1.25×0.9×0.08 27×0.37+0.37×73

5.79+5.79×99 0.8×(12.5-1.25) 37×16-3.7×60

【答案】3.6;1.863;13.65

357;0.09;37

579;9;370

【解析】

3.6×2.5×0.4

=3.6×(2.5×0.4)

=3.6×1

=3.6

1.81×2.3-2.3

=(1.81-1)×2.3

=0.81×2.3

=1.863

0.4×25+3.65

=10+3.65

=13.65

3.5×102

=3.5×(100+2)

=3.5×lOO+3.5×2

=350+7

=357

1.25×O.9×O.08

=(1.25×0.08)×0.9

=0.1×0.9

=0.09

27×0.37+0.37×73

=(27+73)×O.37

=100×0.37

=37

5.79+5.79×99

=5.79×(1+99)

=5.79×100

=579

0.8×(12.5-1.25)

=0.8×l2.5-0.8×l.25

=10-1

=9

37×l6-3.7×60

=3.7×l60-3.7×60

=3.7×(160-60)

=3.7×100

=370

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