Question

Determina valoarea necunoscutei din egalitatile:,
7-6:(4-9:a)=5 ;(b+b:b×2+5×b):9=9; (6-6×c:9)×15:10=3;

Answer 1

Răspuns:

Explicație pas cu pas:

7 - 6 : ( 4 - 9 : a ) = 5

6 : ( 4 - 9 : a ) = 7 - 5

6 : ( 4 - 9 : a ) = 2

4 - 9 : a = 6 : 2

4 - 9 : a = 3

9 : a = 1

a = 9 : 9

a = 1

_______________________

( b + b : b × 2 + 5 × b ) : 9 = 9 ( exercitiu este incomplet )

b + 1 × 2 + 5 × b = 9 × 9

6 × b + 2 = 81

6 × b = 81 - 2

b = 79 : 6

b = 13,1(6)

____________________

( 6 - 6 × c : 9 ) × 15 : 10 = 3

( 6 - 6 × c : 9 ) × 15 = 3 × 10

6 - 6 × c : 9 = 30 : 15

6 - 6 × c : 9 = 2

6 × c : 9 = 6 - 2

6 × c = 4 × 9

6 × c = 36

c = 36 : 6

c = 6