Question

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Answer 1

a) x = 2 × 7 ÷ 5 = 14 ÷ 5 = 2,8

b) a = 15 × 6 ÷ 2 = 15 × 3 = 45

c) x + 1 = 8 × 27 ÷ 9 = 8 × 3 = 24; x = 24 - 1 = 23

d) 2a + 1 = 5 × 28 ÷ 4 = 5 × 7 = 35; a = (35 - 1) ÷ 2 = 34 ÷ 2 = 17

Answer 2

Răspuns:

Explicație pas cu pas:

a)

5x= 7*2

5x= 14

x= 14/5

-

b)

2a= 6*15

2a= 90

a= 90:2

a= 45

-

c)

27*8= 9*( x+1)

216= 9x+5

9x= 216-9

9x= 207

x= 207:9

x= 23

-

d)

28*5= 4*(2a+1)

140= 8a+4

8a= 140-4

8a= 136

a= 136:8

a= 17