Question

Toate inafara de 1 si 2 va rog dau coroana plus 30 de puncte

Answer 1

3)

(x:5 + 210) : 100 = 6

(x:5 + 210) = 6 x 100  = 600

x:5 = 600 - 210 = 390

x = 390 : 5

x = 78

4)

25 - {27 : [(36 - 27 :3) : 3] + 42 : 7 * 3}

25 - {27 :[(36 - 9) : 3] + 6 * 3}

25 - {27 :[(36-9) : 3] + 18}

25 - [27 :(27 : 3) + 18]

25 - (27 : 9 + 18)

25 - (3 + 18)

25 - 21 = 4

5)

a : 9 = 8

a = 8 x 9

a = 72

6)  

a + b = 35 x 2

b = a * 6

a + a * 6 = 70

7a = 70

a = 70 : 7

a = 10

b = 10 * 6

b = 60

**POATE A SA FIE 60 / B SA FIE 10**

7)  

a = 50 + 80 : 2 - 30

a = 50 + 40 - 30

a = 90 - 30

a = 60

b = (19 + 19 * 5) : 19

b = (19 + 95) : 19

b = 114 : 19

b = 6

c = (57 * 3 - 57) : 114

c =  (171 - 57) : 114

c = 114 : 114

c = 1

5 * a + 4 * b - 3 * c + 27

5 * 60 + 4 * 6 - 3 * 1 + 27

300 + 24 - 3 + 27

324 - 3 + 27

321 + 27 = 348

8)

a + b + c = 219

b = a + 1

c = a + 2

a + a + 1 + a + 2 = 219

3a = 219 - 3

3a = 216

a = 216 : 3

a = 72

b = 72 + 1

b = 73

c = 72 + 2

c = 74

imi cer scuze ca nu am putut sa il fac pe 9,