脱式计算，能简算的要简算．6.5×10.1 &n...

①6.5×10.1  
=6.5×（10+0.1）
=6.5×10+6.5×0.1
=65+0.65
=65.65
                   
②0.25×0.8×4×0.125
=（0.25×4）×（0.125×0.8）
=1×0.1
=0.1

③0.75×18÷0.15
=（0.75÷0.15）×18
=5×18
=90
                 
④2.5×3.7+6.3×2.5
=2.5×（3.7+6.3）
=2.5×10
=25

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