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I like Math English 25/12/2017 at 20:14\(\)20+30+40+50+60=
(20+60)+(30+50)+4=
80+80+40=
160+40=
200
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Nguyễn Huyền Nhi 25/12/2017 at 21:11\(20+30+40+50+60\)
\(=\left(20+60\right)+\left(30+50\right)+40\)
= \(80+80+40\)
\(=200\)