a) 26+27+28+29+30+31+32+33 b) 20+21+22+…+29+30

0 bình luận về “a) 26+27+28+29+30+31+32+33 b) 20+21+22+…+29+30”

1. a) 26+27+28+29+30+31+32+33

   =26+(27+33)+(28+32)+(29+31)+30

   =26+60+60+60+30

   =(26+30)+60×3

   =86+180

   =266

   b)20+21+22+…+29+30

   =(30+20)+(21+29)+(22+28)+(23+27)+(24+26)+25

   =50+50+50+50+50+25

   =50×5+25

   =250+25

   =275

   Chúc hok tốt!!

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2. a) 26+27+28+29+30+31+32+33

   = 236 

   b) 20+21+22+…+29+30

   = ( 20 + 30 ) + ( 21 + 29 ) + ….. + 25

   = 50 + 50 + ……. + 25 

   = 5 × 50 + 25 

   = 250 + 25 

   = 275 

   Bạn cho mk ctlhn nha ***

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