Question

media aritmetica a 4 nr consecutive este 7,5. aflati nr ​

Answer 1

Răspuns:

fie x, x+1, x+2, x+3 -patru numere consecutive

(x+ x+1+ x+2+ x+3 )/4=7,5

4x+6=4*7,5
4x+6=30
4x=30-6

4x=24
x=24/4
x=6
=> x+1=7
x+2=8
x+3=9

=> S:{6,7,8,9}

Answer 2

Răspuns:

(a+b+c+d)/4=7,5

(a+a+1+a+2+a+3)/4=7,5

(4a+6)/4=7,5

4a+6=4×7,5

4a+6=30

4a=30-6

4a=24

a=24÷4

a=6

b=6+1=7

c=6+2=8

d=6+3=9

V:6+7+8+9=30

30÷4=7,5