0.79×0.79×99=?求简便方法!

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0.79×0.79×99=?求简便方法!0.79×0.79×99=?求简便方法!0.79×0.79×99=?求简便方法!0.79×0.79×99=(0.8-0.01)(0.8-0.01)(100-1)

0.79×0.79×99=?求简便方法!
0.79×0.79×99=?求简便方法!

0.79×0.79×99=?求简便方法!
0.79×0.79×99
=(0.8-0.01)(0.8-0.01)(100-1)
=(0.8-0.01)²(100-1)
=(0.64-0.016+0.0001)(100-1)
=0.6241*100-0.6241*1
=62.41-0.6241
=61.7859