Question

Am nevoie de ajutor la ex 7,8,9​

Answer 1

Răspuns:

7) A=3/12+6/12+4/12=13/12=1,08(3)

   B=4/4+2/4+1/4=7/4=1/75

   C=20/30+2/30+4/30=26/30=0,8(6)

8) A= (2/3+1/3)+3/4+1/4)+4/5+1/5)=3/3+4/4+5/5=1+1+1=3

   B=(5/6+7/6)+(1/7+6/7)=12/6+7/7=2+1=3

   C= (7/6-1/6)-(7/3-1/3)-(7/2-1/2)=6/6-6/3-6/2=1-2-3=-4

   D= (3/2-1/2)+(1/3-10/3)+(9/7-2/7)=2/2-9/3+7/7=1+1-3=-1

 9) A= 13/24+11/24=24/24=1

      B= 7/5+4/5=11/5

      C= 7/5-2/5=5/5=1

      D=6/7-6/7=0

Explicație pas cu pas: