数学题在线解巧算11+192+1993+19994+199995+1999996+19999997+199999998=

问题描述:

数学题在线解巧算11+192+1993+19994+199995+1999996+19999997+199999998=

原式=(20-9)+(200-8)+(2000-7)+(20000-6)+(200000-5)+(2000000-4)+(20000000-3)+(2000000000-2)
=222222222-(9+8+7+6+5+4+3+2)
=222222222-44
=222222176