12.73×9.9+127.3简便运算?
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12.73×9.9+127.3
=12.73×9.9+12.73×10
=12.73×(9.9+10)
=12.73×19.9
=12.73×(20-0.1)
=12.73×20-12.76×0.1
=254.6-1.273
=253.327
=12.73×9.9+12.73×10
=12.73×(9.9+10)
=12.73×19.9
=12.73×(20-0.1)
=12.73×20-12.76×0.1
=254.6-1.273
=253.327
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