这道题怎么巧算?求过程.
28000-105-95-106-94-107-93-108-92-109-91-110-90-111-89-112-88-113-87-114-86-115-85-11...
28000-105-95-106-94-107-93-108-92-109-91-110-90-111-89-112-88-113-87-114-86-115-85-116-84-117-83-118-82-119-81-120-80
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1个回答
2016-10-11
展开全部
28000-105-95-106-94-107-93-108-92-109-91-110-90-111-89-112-88-113-87-114-86-115-85-116-84-117-83-118-82-119-81-120-80
=28000-(105+95)-(106+94)-(107+93)-(108+92)-(110+90)-(111+89)-(112+88)-(113+87)-(114+86)-(115+85)-(116+84)-(117+83)-(118+82)-(119+81)-(120+80)
=28000-200×16
=28000-3200
=24800
=28000-(105+95)-(106+94)-(107+93)-(108+92)-(110+90)-(111+89)-(112+88)-(113+87)-(114+86)-(115+85)-(116+84)-(117+83)-(118+82)-(119+81)-(120+80)
=28000-200×16
=28000-3200
=24800
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