Question

Află valoarea numărului a:




PLS​

Answer 1

Răspuns:

(16-4+8):a=5

(12+8):a=5

20:a=5

a=4.

Succes!

Answer 2

a) [(16-2•2+4•2) : a] + 3 = 8

[(16-4+8) : a] + 3 = 8

[(12+8) : a] + 3 = 8

(20 : a) + 3 = 8

20 : a = 8 | - 3

20 : a = 5

a = 20 : 5

a = 4

b) 5+15• (25-75:5+25:a) = 1150 : 5

5+15 • (25-15+25:a) = 230

15 • (25-15+25:a) = 230 | - 5

15 • (25-15+25:a) = 225

25-15+25:a = 225 | : 15

25-15+25:a = 15

25:a = 5

a = 5

c) 3+2•{[72-12•(a-3) ]-9•4} = 27

3+2•[(72-12a-36) - 9•4] = 27

3+2•[(72-36-12a) - 9•4] = 27

3+2•[(36-12a) - 9•4] = 27

2•[(36-12a) - 9•4] = 27 | - 3

2• [(36-12a) -9•4] = 24 | : 2

(36-12a) - 9•4 = 12

(36-12a) - 9 = 12| : 4

(36-12a) - 9 = 3

36-12a = 3+9

36-12a = 12

a = 2