计算:9999*9999+19999=__=__=__=__

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计算:9999*9999+19999=__=__=__=__
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计算:9999*9999+19999=__=__=__=__
计算:9999*9999+19999=__=__=__=__

计算:9999*9999+19999=__=__=__=__
9999*9999+19999=9999*9999+19998+1=9999*9999+9999*2+1=(9999+1)^2=100000000(10^8)

9999^2+2*9999*1+1^2=(9999+1)^2=10^8