题目内容

【题目】脱式计算,能简算的要简算。

①2.75×6.2+27.5×0.38

②0.125×32×2.5

③15.72-2.17-1.83+4.28

④ 144

(+1÷)

⑥ [1-(+)]÷

【答案】① 27.5 10 ③ 16 ④ 112 ⑥ 5

【解析】

①2.75×6.2+27.5×0.38

=2.75×6.2+2.75×3.8

=2.75×6.2+3.8

=2.75×10

=27.5

②0.125×32×2.5

=0.125×8×4×2.5

=0.125×8×4×2.5

=1×10

=10

③15.72-2.17-1.83+4.28

=15.72+4.28-2.17+1.83

=20-4

=16

④144

=(144+)

=144+

=112+

=112

(+1÷)

=(+)

=

=

⑥[1-(+)]÷

=[1-

=12

=5

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