99999*99999+199999简算

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99999*99999+199999简算99999*99999+199999简算99999*99999+199999简算99999*99999+199999=(100000-1)^2+199999=1

99999*99999+199999简算
99999*99999+199999简算

99999*99999+199999简算
99999*99999+199999
=(100000-1)^2+199999
=100000^2-100000*2-1+199999
=10000000000

99999*99999+199999
=99999*(100000-1)+199999
=9999900000-99999+199999
=9999900000+100000
=10000000000