Question

Determinati pe a:[(5×a+19)×7-2]:9=35




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Answer 1

Salutare!

            Cerinta:

"Determinati pe a: [(5 × a + 19) × 7 - 2] : 9 = 34 "

        Rezolvare:

$\bf [(5\cdot a+19)\cdot7-2]:9=34$

$\bf [(5\cdot a+19)\cdot7-2]=34\cdot 9$

$\bf (5\cdot a+19)\cdot7-2=306$

$\bf (5\cdot a+19)\cdot7=306+2$

$\bf (5\cdot a+19)\cdot 7=308$

$\bf (5\cdot a+19)=308:7$

$\bf 5\cdot a+19=44$

$\bf 5\cdot a =44-19$

$\bf 5\cdot a =25$

$\bf a =25:5$

$\boxed{\bf a =5}$

==pav38==

Answer 2

Răspuns:

[(5×a+19)×7-2]:9=34

(5×a+19)×7-2=34·9

(5×a+19)×7=306+2

5a+19=308:7

5a=44-19

a=25:5

a=5