72×9.9 简便运算
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72×9.9 简便运算
=72×(10-0.1)
=72×10-72×0.1
=720-0.72
=712.8
72x9.9
=72x(10-0.1)
=72x10-72x0.1
=720-7.2
=712.8
72×9.9
=72*(10-0.1)
=72*10-72*0.1
=720-7.2
=712.8
72×9.9 简便运算
=72×(10-0.1)
=72×10-72×0.1
=720-0.72
=712.8
72x9.9
=72x(10-0.1)
=72x10-72x0.1
=720-7.2
=712.8
72×9.9
=72*(10-0.1)
=72*10-72*0.1
=720-7.2
=712.8