巧算:887+888+889+997+998+999

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巧算:887+888+889+997+998+999
巧算:887+888+889+997+998+999

巧算:887+888+889+997+998+999
887+888+889+997+998+999
=888×3+998×3
=3×(888+998)
=3×1886
=5658

887+999=1886,998+888=1886,997+889=1886,1886*3=5658

=(887+999)*3=1886*3=5658

(⊙o⊙)…好快~

= 900-13+900-12+900-11 + 1000-3+1000-2+1000-1
= 900+900+900+ 1000+1000+1000-13-12-11-3 -2-1
= 2700+3000-36-6
= 5700-42
= 5658