دانلود کتاب Mathematical Quickies: 270 Stimulating Problems with Solutions (Dover Books on Mathematical and Word Recreations)
by Charles W. Trigg
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عنوان فارسی: Quickies ریاضی : 270 مشکلات تحریک کننده با راه حل ( دوور کتاب های ریاضی و تفریح ورد) |
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And not all of these problems are necessarily "quickies". For instance, one asks multiplcation of a very large number by 125 -- the quickie solution is to multiply by 1000 and divide by 8, but this is not even so "quick".