99999999*99999999=?(要解法)

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99999999*99999999=?(要解法)99999999*99999999=?(要解法)99999999*99999999=?(要解法)99999999*(100000000-1)=99999

99999999*99999999=?(要解法)
99999999*99999999=?(要解法)

99999999*99999999=?(要解法)
99999999*(100000000-1)=9999999900000000-99999999=9999999800000001

99999999*99999999
=(100000000-1)*(100000000-1)
=100000000*100000000-2*1*100000000+1
=9999999800000001

99999999*99999999
=(10^8-1)^2
=10^16-2*10^8+1
=10000000000000000-200000000+1
=99999999800000001

99999999*99999999
=(100000000-1)*(100000000-1)
=100000000*100000000-2*1*100000000+1
=9999999800000001

(100000000-1)*99999999
=100000000*99999999-1*99999999
=9999999900000000-99999999
=(9999999800000000+100000000)-99999999
=9999999800000000+100000000-99999999
=9999999800000000+1
=9999999800000001

99999999*99999999
=99999999*(100000000—1)
99999999*100000000-99999999*1
9999999900000000-9999999
9999999800000001

99999999*99999999
=99999999*100000000-99999999
=9999999800000001