2.4×102×0.32
=12/5×102×8/25
=（12×102×8）/125
=（96×102）/125
=｛96×（100+2）｝/125
=｛9600+192｝/125
=9792/125
2.4X102X0.32
=2.4X100X0.32+2.4X2X0.32
=2.4X30+2.4X2+4.8X0.32
=72+4.8+5X0.32-0.2X0.32
=76.8+1.6-0.064
=78.4-0.1+0.036
=78.336
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