@ 1.72×5.4-0.52×7.2怎么巧算？
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1.72×5.4－0.52×7.2
=1×5.4+0.72×5.4－0.52×7.2
=5.4+0.72×5.4－5.2×0.72
=5.4+0.72×(5.4－5.2)
=5.4+0.72×0.2
=5.4+0.144
=5.544
=1×5.4+0.72×5.4－0.52×7.2
=5.4+0.72×5.4－5.2×0.72
=5.4+0.72×(5.4－5.2)
=5.4+0.72×0.2
=5.4+0.144
=5.544
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1.72×5.4-0.52×7.2
=17.2×0.54-0.52×7.2
=10×0.54+7.2×0.54-0.52×7.2
=10×0.54+（0.54-0.52）×7.2=5.4+0.144
=5.544
=17.2×0.54-0.52×7.2
=10×0.54+7.2×0.54-0.52×7.2
=10×0.54+（0.54-0.52）×7.2=5.4+0.144
=5.544
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1.72*5.4-0.52*7.2
=(1+0.72)*5.4-0.52*7.2
=5.4+0.72*5.4-0.52*0.72*10
=5.4+0.72*(5.4-0.52*10)
=5.4+0.72*0.2
=5.4+0.144
=5.544
=(1+0.72)*5.4-0.52*7.2
=5.4+0.72*5.4-0.52*0.72*10
=5.4+0.72*(5.4-0.52*10)
=5.4+0.72*0.2
=5.4+0.144
=5.544
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=5.4+0.72×5.4-0.52×7.2
=5.4+7.2×0.54-0.52×7.2
=5.4+7.2×（0.54-0.52）
=5.4+7.2×0.02=5.544
=5.4+7.2×0.54-0.52×7.2
=5.4+7.2×（0.54-0.52）
=5.4+7.2×0.02=5.544
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