5) 5( x + 12 ) + 22 = 92

5( x + 12 ) = 92 - 22

5( x + 12 ) = 70

x + 12 = 70 : 5

x + 12 = 14

x = 14 - 12

x = 2

6) 95 - 5( x + 2 ) = 45

5( x + 2 ) = 95 - 45

5( x + 2 ) = 50

x + 2 = 50 : 5

x + 2 = 10

x = 10 - 2

x = 8

7) 14x + 54 = 82

14x = 82 - 54

14x = 28

x = 28 : 14

x = 2

8) 15x - 133 = 17

15x = 17 + 133

15x = 150

x = 150 : 15

x = 10

9) 155 - 10( x + 1 ) = 55

10( x + 1 ) = 155 - 55

10( x + 1 ) = 100

x + 1 = 100 : 10

x + 1 = 10

x = 10 - 1

x = 9

b) theo đề ta có: \(\frac{x}{5}=\frac{y}{3}\) và x + y = 16

áp dụng t/c DTSBN ta có:

\(\frac{x}{5}=\frac{y}{3}=\frac{x+y}{5+3}=\frac{16}{8}=2\)

=> \(\frac{x}{5}=2=>x=10\)

\(\frac{y}{3}=2=>y=6\)

vậy x = 10 ; y = 6

chúc bn hok tốt!!

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