Question

calculați prin suma lui Gauss
1. 1+2+3+...+30=

2. 1+2+3+...+60=

3. 1+2+3+...+200=​

Answer 1

Răspuns:

1) = (30x31):2=930:2=465

2). = (60x61):2=2660:2=1830

3). =(200x201):2=40200:2=20.100

Answer 2

Răspuns:

1. 30×(30+1):2=

30×31:2=

15×31=

465

2. 60×(60+1):2=

60×61:2=

30×61=1830

3. 200×(200+1):2=

200×201:2=

100×201=

20100