题目内容

【题目】下面各题,怎样简便就怎样算。

4.57+3.17+3.43+5.83 23.75-8.64-3.36

45.55-(6.82+15.55) 27.38-5.34+2.62-4.66

【答案】17 11.75

23.18 20

【解析】

4.57+3.17+3.43+5.83

=(4.57+3.43)+(3.17+5.83)

=8+9

=17

23.75-8.64-3.36

=23.75-(8.64+3.36)

=23.75-12

=11.75

45.55-(6.82+15.55)

=45.55-15.55-6.82

=30-6.82

=23.18

27.38-5.34+2.62-4.66

=(27.38+2.62)-(5.34+4.66)

=30-10

=20

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