15.6*1.01
=15.6*(1+0.01)
=15.6*1+15.6*0.01
=15.6+0.156
=15.756
1.25*6.4*0.25
=1.25*(8*4*0.2)*0.25
=(1.25*8)*(4*0.25)*0.2
=10*1*0.2
=2
15.6×（10+0.1）
=15.6×1+15.6×0.1
=15.6+1.56
=17.16
1.25×8×0.2×4×0.25
=（1.25×8）×0.2×（4×0.25）
=10×0.2×1
=2
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