Упростите выражение: 1) 9*a*12*5*b = 4) 3p*5k*2t = 7) n+21n = 2) 8*c*15*d = 5) 9a+21a = 8) 45p-15+p 3) m*25*n*4 = 6) 56c-48c = 9) 12x+68x-x.

Упростим выражения:

1) 9 * a * 12 * 5 * b = 9 * 12 * 5 * a * b = 9 * 60 * a * b = 540 * a * b;

4) 3 * p * 5 * k * 2 * t = 3 * 5 * 2 * p * k * t = 3 * 10 * p * k * t = 30 * p * k * t;

7) n + 21 * n = n * (1 + 21) = n * 22 = 22 * n;

2) 8 * c * 15 * d = 8 * 15 * c * d = 8 * 5 * 3 * c * d = 40 * 3 * c * d = 120 * c * d;

5) 9 * a + 21 * a = a * (9 + 21) = a * 30 = 30 * a;

8) 45 * p - 15 * p = p * (45 - 15) = p * 30 = 30 * p;

3) m * 25 * n * 4 = 25 * 4 * m * n = 100 * m * n;

6) 56 * c - 48 * c = c * (56 - 48) = c * 8 = 8 * c;

9) 12 * x + 68 * x - x = x * (12 + 68 - 1) = x * (12 + 67) = x * 79 = 79 * x.