Question

Va rog rezolvati ecuatiile:
(5x-32):4=17
(z:9)*15-47=28
92+56:(14-y)=100

Answer 1

( 5x - 32 ) : 4 = 17
5x - 32 = 17 * 4
5x - 32 = 68 
5x = 68 + 32
5x = 100
x = 100 : 5
x = 20
Verificare: ( 5 * 20 - 32 ) : 4 = 17
( 100 - 32 ) : 4 = 17
68 : 4 = 17 ( adevărat )

( z : 9 ) * 15 - 47 = 28
( z : 9 ) * 15 = 28 + 47
( z : 9 ) * 15 = 75
z : 9 = 75 : 15
z : 9 = 5
z = 5 * 9
z = 45
Verificare: ( 45 : 9 ) * 15 - 47 = 28
5 * 15 - 47 = 28
75 - 47 = 28 ( adevărat )

92 + 56 : ( 14 - y ) = 100
56 : ( 14 - y ) = 100 - 92
56 : ( 14 - y ) = 8
14 - y = 56 : 8
14 - y = 7
y = 14 - 7
y = 7
Verificare: 92 + 56 : ( 14 - 7 ) = 100
92 + 56 : 7 = 100
92 + 8 = 100 ( adevărat )