9999999999+888888888+77777777+6666666简便运算
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9999999999+888888888+77777777+6666666
=(9999999999+1)-1+(888888888+2)-2+(77777777+3)-3+(6666666+4)-4
=10000000000-1+900000000-2+80000000-3+7000000-4
=10000000000+900000000+80000000+7000000-1-2-3-4
=10987000000-10
=10986999990
=(9999999999+1)-1+(888888888+2)-2+(77777777+3)-3+(6666666+4)-4
=10000000000-1+900000000-2+80000000-3+7000000-4
=10000000000+900000000+80000000+7000000-1-2-3-4
=10987000000-10
=10986999990
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