Question

afla suma nr de la 0 la 10 grupeaza termenii in mod convenabil foloseste comutativitatea

Answer 1

0 + 1+2+3+4+5+6+7+8+9+10 =
=( 0+ 10 ) + ( 1 + 9 ) + ( 2 +8 ) + ( 3 + 7 ) + ( 4 +6 )  + 5 = 
= 10 + 10 + 10 + 10 + 10 + 5 
=50 +5 = 55

Answer 2

0+1+2+3+4+5+6+7+8+9+10
⇒[0+10]+[1+9]+[2+8]+[3+7]+[4+6]+5
⇒10+10+10+10+10+5
⇒50+5
⇒55;