👤

{3×[(4+a)×8]+10}÷5=98


Răspuns :

{ 3 × [ ( 4 + a ) × 8 ] + 10 } : 5 = 98

3 × [ ( 4 + a ) × 8 ] + 10 = 98 × 5

3 × [ ( 4 + a ) × 8 ] + 10 = 490

3 × [ ( 4 + a ) × 8 ] = 490 - 10

3 × [ ( 4 + a ) × 8 ] = 480

( 4 + a ) × 8 = 480 : 3

( 4 + a ) × 8 = 160

4 + a = 160 : 8

4 + a = 20

a = 20 - 4

a = 16