17*2а*5 = 17a*10 = 170a
No2
11x + 5x - 7 = (11x + 5)x - 7 = 16x - 7
No 3
a)(x - 12) *7=182
7x - 12 *7
7x - 84
7x -84 + 84 = 182 + 84
7x = 182 + 84
7x = 266
7x ÷7 = 266 ÷7
7x = 266 ÷ 7
x = 38
б) 117 ÷ (x -8) = 13
117 ÷(x -8) = 13, x = 8
117 =13
x-8
117 = 13(x -8)
9 = x-8
- x = - 8 - 9
- x = - 17
x = 17 , x = 8
x = 17
17*2а*5 = 17a*10 = 170a
No2
11x + 5x - 7 = (11x + 5)x - 7 = 16x - 7
No 3
a)(x - 12) *7=182
7x - 12 *7
7x - 84
7x -84 + 84 = 182 + 84
7x = 182 + 84
7x = 266
7x ÷7 = 266 ÷7
7x = 266 ÷ 7
x = 38
б) 117 ÷ (x -8) = 13
117 ÷(x -8) = 13, x = 8
117 =13
x-8
117 = 13(x -8)
9 = x-8
- x = - 8 - 9
- x = - 17
x = 17 , x = 8
x = 17