Question by Hương Yêu Dấu - Discuss with MathYouLike

Hương Yêu Dấu

09/12/2017 at 12:51

20+30+40+50+60+70+80=?

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I like Math English 09/12/2017 at 12:54

20+30+40+50+60+70+80=

(20+80)+(30+70)+(40+60)+50=

100+100+100+50=

300+50=

350
Hương Yêu Dấu selected this answer.
Mons Trần 09/12/2017 at 13:24

We have:20+30+40+50+60+70+80

= ( 20 + 30 + 40 ) + (60 + 70 + 80) + 50

= 30 . 3 + 70 .3 + 50

= 100.3 + 50

= 300 + 50

= 350
Trần Quỳnh Anh 27/12/2017 at 13:04

20+30+40+50+60+70+80

= (20+80)+(30+70)+(40+60)+50

= 100+100+100+50

+350

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