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)=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

99999999*99999999= 99999999*99999999= 99999999 99999999 99999999*99999999=?（要解法） 99999999/55555= 99999999x99999999= 99999999×99999999 等于多少, 999999999+99999999+9999999+3=? 99999999x99999999 99999999X99999999 98989898×99999999÷1010101÷11111111=? 98989898×99999999÷1010101÷11111111=? 1+2+3+4+.+99999998+99999999=? 一道数学题：99999999*11111111/55555555=? 99999999+9999999+999999+ + + + + + + + + + + + + + + + +99999999+1111111+888888+22222+7777+333+66+4=?过程详细些！！！！！怎样算算出99999999×99999999的积 98989898*99999999/10101010/11111111