99...9(100个9)*99...9(100个9)+199...9(100个9)末尾有几个零
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99...9(100个9)*99...9(100个9)+199...9(100个9)末尾有几个零99...9(100个9)*99...9(100个9)+199...9(100个9)末尾有几个零99..
99...9(100个9)*99...9(100个9)+199...9(100个9)末尾有几个零
99...9(100个9)*99...9(100个9)+199...9(100个9)末尾有几个零
99...9(100个9)*99...9(100个9)+199...9(100个9)末尾有几个零
99...9(100个9)*99...9(100个9)+199...9(100个9)
= 99...9(100个9)*99...9(100个9)+2*99...9(100个9)+1
= [99...9(100个9)+1]*[99...9(100个9)+1]
= 100...0(100个0)*100...0(100个0)
= 100...0(200个0)
即:末尾有 200 个零.
99.9【100个9】×99.【100个9】+99.【100个9】+100.0【100个0】简便运算
99...9(100个9)*99...9(100个9)+199...9(100个9)末尾有几个零
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