用简便算19999+2999+399+49这道题怎么算?
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![用简便算19999+2999+399+49这道题怎么算?](/uploads/image/z/2601472-40-2.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E7%AE%9719999%2B2999%2B399%2B49%E8%BF%99%E9%81%93%E9%A2%98%E6%80%8E%E4%B9%88%E7%AE%97%3F)
用简便算19999+2999+399+49这道题怎么算?
用简便算19999+2999+399+49这道题怎么算?
用简便算19999+2999+399+49这道题怎么算?
原式=19999+2999+399+46+1+1+1=(19999+1)+(2999+1)+(399+1)+46=20000+3000+400+46=23446
19999+2999+399+49
=(20000-1)+(3000-1)+(400-1)+(50-1)
=20000-1+3000-1+400-1+50-1
=(20000+3000+400+50)-(1+1+1+1)
=23450-4
=23446