用简便方法计算。⑴5.85+1.89+2.15⑵24.8+14.6+15.4⑶42.5﹣22.17﹣7.83⑷3.8+1.37+6.2+12.63
3.6×0.25×4=
÷=
- =
0.64÷0.08=
27×=
÷
=
- 
=
=
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