5乘以99999999
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5乘以999999995乘以999999995乘以9999999949999995=5*100000000-5=4999999955*（100000000-1）=5*100000000-5=49999
5乘以99999999
5乘以99999999
5乘以99999999
49999995
=5*100000000-5=499999995
5*（100000000-1）=5*100000000-5=499999995
用简算法
5×99999999
=5×（100000000-1）
=5×100000000-5×1
=500000000-5
=499999995
49999995
5乘以99999999=499999995
5乘以99999999
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