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

⑤(+1÷)

⑥ [1-(+)]÷

【答案】① 27.5 ② 10 ③ 16 ④ 112⑤ 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

⑤(+1÷)

=(+)

=

=

⑥[1-(+)]÷

=[1-]÷

=12

=5