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0.72x10.1
=0.72×(10+0.1)
=0.72×10+0.72×0.1
=7.2+0.072
=7.272
9.98x9.9
=9.98×(10-0.1)
=9.98×10-9.98×0.1
=99.8-0.998
=98.802
6.4x0.25x12.5
=(8×0.25)×(0.8×12.5)
=2×10
=20
43x11.8十5.7x118
=43x11.8十57x11.8
=(43+57)x11.8
=100x11.8
=1180
=0.72×(10+0.1)
=0.72×10+0.72×0.1
=7.2+0.072
=7.272
9.98x9.9
=9.98×(10-0.1)
=9.98×10-9.98×0.1
=99.8-0.998
=98.802
6.4x0.25x12.5
=(8×0.25)×(0.8×12.5)
=2×10
=20
43x11.8十5.7x118
=43x11.8十57x11.8
=(43+57)x11.8
=100x11.8
=1180
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