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8.9x1.1x4.7
=8.9x〔(1+0.1)x4.7〕
=8.9x〔4.7+0.47〕
=8.9x5.17
=(10-1.1)x5.17
=51.7-1.1x5.17
=51.7-〔5.17x(1+0.1)〕
=51.7-(5.17+0.517)
=51.7-5.687
=46.013
=8.9x〔(1+0.1)x4.7〕
=8.9x〔4.7+0.47〕
=8.9x5.17
=(10-1.1)x5.17
=51.7-1.1x5.17
=51.7-〔5.17x(1+0.1)〕
=51.7-(5.17+0.517)
=51.7-5.687
=46.013
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