72×125的簡便算法

2023-01-08 11:21

2023-01-08 11:43
72×125
=9×8×125
=9×1000
=9000
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72x125
=125x8x9
=1000×9
=9000
解答:把72分成8和9(8x9),8×125正好等于1000(湊整),1000×9,剛好等于9000。
72×125
=(8×9)×125
=(8×125)×9
=1000×9
=9000
72×125
=9×8×125
=9×(8×125)
=9×1000
=9000
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