【17.1-17.1除以(3.1-5分之6)】x0.6
=(17.1-17.1÷1.9)×0.6
=(17.1-9)×0.6
=8.1×0.6
=4.86
0.28x4.17+0.28x5.83
=0.28×(4.17+5.83)
=0.28×10
=2.8
12.5x3.2x250
=12.5×(0.8×4)×250
=(12.5×0.8)×(4×250)
=10×1000
=10000
0.65x14+87x65%-20分之13
=0.65×14+0.65×87-0.65
=0.65×(14+87-1)
=0.65×100
=65
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