99.9*99.9+199.9简便算法.
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99.9*99.9+199.9简便算法.99.9*99.9+199.9简便算法.99.9*99.9+199.9简便算法.99.9*99.9+199.9=10179.91=99.9×99.9+99.9+
99.9*99.9+199.9简便算法.
99.9*99.9+199.9简便算法.
99.9*99.9+199.9简便算法.
99.9*99.9+199.9=10179.91
=99.9×99.9+99.9+100
=99.9×(99.9+1)+100
=99.9×100.9+100
=(100-0.1)×100.9+100
=10090-10.09+100
=10179.91
（100-0.1）（100-0.1）+200-0.1
10000-20+0.01+200-0.1
10179.91