Question

ma pute ti ajuta la aceasta tema dar si as dori si explicatii va rog frumos.
{1+2×[1+2×(3+2×5)]-50}:5=
{964:4+800:8×7-65×10:5×3+2×12):5=
4+8+12+16+...+36+40=
11+2×[3+(4+5×6]:2]:5-13=
72+72:6×3-15×3+9×5

Answer 1

{1+2×[1+2×(3+2×5)]-50}:5= {1+2*[1+2*(13)]-50}:5={1+2*[27]-50}:5={5}:5=1 ;

(964:4+800:8×7-65×10:5×3+2×12):5=(241+700-390+24):5=575:5=115 ;

... = 4·(1+2+3+4+ ... +9+10) = 4· (10*11 : 2) = 4· 55 = 220 ;

11+2×[3+(4+5×6):2]:5-13 = 11+2·[3+(34):2]:5-13 = 2·[20]:5-13=8-13= - 5 ;

72+72:6×3-15×3+9×5= 72 + 12×3 - 45 + 45 = 72+36 = 36 ;  

Answer 2

a). {1+2*[1+2*(3+2*5)]-50}:5=
      ={1+2*[1+2*(3+10)]-50}:5=
      ={1+2*[1+26]-50}:5=
      ={1+2*27-50}:5=
      ={1+54-50}:5=
      =5:5=1

b). (964:4+800:8*7-65*10:5*3+2*12):5=
      =(241+100*7-650:5*3+24):5)=
      =(241+700-130*3+24):5=
      =(241+700-390+24):5=
      =(941-390+24):5=
      =(551+24):5=
      =575:5=115

c). 4+8+12+16+...+36+40=(4+40)*10:2=44*10:2=440:2=220

d). 11+2*[3+(4+5*6):2]:5-13=
      =11+2*[3+34:2]:5-13=
      =11+2*(3+17):5-13=
      =11+2*20:5-13=
      =11+40:5-13=
      =11+8-13=
      =19-13=6

e). 72+72:6*3-15*3+9*5=
      =72+12*3-45+45=
      =72+36-45+45=
      =108-45+45=
      =63+45=108.