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,
