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efectuează grupând convenabil termenii
a) 10+15+20+25+30.
b)50+75+100+125+150.
c) 2500+782+3500+218.
d) 2400+520+3500+80.​

Răspuns :

Răspuns:

A) 10+15+20+25+30=(10+30)+(15+25)+20=40+40+20=80+20=100

B)50+75+100+125+150=(50+150)+(75+125)+100=200+200+100=500

C)2500+782+3500+218=(2500+3500)+(782+218)=6000+1000=7000

D) 2400+520+3500+80=(2400+3500)+(520+80)=5900+600=6500

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