Question

Afla numarul necunoscut:
a : 5 + 147 × 4 = 3 × 225
[( a - 2) × 3 + 26] : 25 = 8
3 + 3 × [3 + 3 × (3 + 3 × 3)] = (3 × a + 3) × 3 + 3

Answer 1

1) 
a : 5 + 147 x 4 = 3 x 225
a : 5 + 588 = 675
a : 5 = 675 - 588
a : 5 = 87
a = 5 x 87
a = 435

2)
[(a-2)x3+26]:25=8
[3a-6+26] = 8 x 25
3a+20=200
3a=200-20
3a=180
a=180:3
a=60

3)
3+3x[3+3x(3+3x3)]=(3a+3)x3+3
3+3x[3+3 x 12]=9a+9+3
3+3x39=9a+12
3+117=9a+12
120-12=9a
108=9a
a=108:9
a=12

Answer 2

1) a : 5 + 147 x 4 = 3 x 225
a : 5 + 588 = 675
a : 5 = 675 - 588
a : 5 = 87
a = 5 x 87
a = 435

2) [(a-2)x3+26]:25=8
[3a-6+26] = 8 x 25
3a+20=200
3a=200-20
3a=180
a=180:3
a=60

3) 3+3x[3+3x(3+3x3)]=(3a+3)x3+3
3+3x[3+3 x 12]=9a+9+3
3+3x39=9a+12
3+117=9a+12
120-12=9a
108=9a
a=108:9
a=12