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2.01×0.65 1.45+2.8+8.55
=（2+0.01）×0.65 =1.45+8.55+2.8
=2×0.65+0.01×0.65 =10+2.8
=1.3+0.0065 =12.8
=1.3065
3.2×4.5×1.25 72×0.125
=4×0.8×5×0.9×0.25×5 =8×9×0.125
=4×5×5×0.25×0.8×0.9 =8×0.125×9
=100×0.25×0.8×0.9 =1×9
=25×0.8×0.9 =9
=20×0.9
=18
4.5×9×1.2 0.02×0.25×5×40
=0.5×9×9×2×0.6 =0.02×5×0.25×40
=0.5×2×9×9×0.6 =0.1×10
=1×9×9×0.6 =1
=81×0.6
=48.6
=（2+0.01）×0.65 =1.45+8.55+2.8
=2×0.65+0.01×0.65 =10+2.8
=1.3+0.0065 =12.8
=1.3065
3.2×4.5×1.25 72×0.125
=4×0.8×5×0.9×0.25×5 =8×9×0.125
=4×5×5×0.25×0.8×0.9 =8×0.125×9
=100×0.25×0.8×0.9 =1×9
=25×0.8×0.9 =9
=20×0.9
=18
4.5×9×1.2 0.02×0.25×5×40
=0.5×9×9×2×0.6 =0.02×5×0.25×40
=0.5×2×9×9×0.6 =0.1×10
=1×9×9×0.6 =1
=81×0.6
=48.6
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