3.2×9.8+98 简便
2016-09-15
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3.2×9.8+98 简便
=3.2×9.8+10×9.8
=(3.2+10)×9.8
=13.2×9.8
=13.2×(10-0.2)
=13.2×10-13.2×0.2
=132-2.64
= 129.36
=3.2×9.8+10×9.8
=(3.2+10)×9.8
=13.2×9.8
=13.2×(10-0.2)
=13.2×10-13.2×0.2
=132-2.64
= 129.36
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