Question

Ex 13 pls dau coroana

Answer 1

Răspuns:

Explicație pas cu pas:

a) 1,2+2,3+3,4+4,0+5,6+6,7+7,8 =

=(1,2+7,8)+(2,3+6,7)+(3,4+5,6)+4 = 9+9+9+4 = 31

b) 1,23+2,34+3,45+5,55+6,66+7,77 =

=(1,23+7,77)+(2,34+6,66)+(3,45+5,55)= 9+9+9 = 27