Question

47.Calculați grupand termenii convenabil :
a) 17+18+19+20+21+22+23+30=
b) 1001+1002+1003+997+998+999=
​

Answer 1

Răspuns:

Explicație pas cu pas:

a) 17+18+19+20+21+22+23+30=

(17 + 23) + (18 + 22) + (19 + 21) + (20 + 30) = 40 + 40 + 40 + 50 = 170

b) 1001+1002+1003+997+998+999=

​(1001 + 999) + (1002 + 998) + (1003 + 997) = 2000 + 2000 + 2000 = 6000

Answer 2

Explicație pas cu pas:

a)

17+18+19+20+21+22+23+30=

(17+23)+(18+22)+(19+21)+(20+30)=

40+40+40+50=

170

b)

1 001+1 002+1 003+997+998+999=

(1 001+999)+(1 002+998)+(1 003+997)=

2 000+2 000+2 000=

6 000