7 * (4 а+2) + 3 * (2*а+1) = ? 4 * (3*в+1) + 7 (6*в+2) = ? 2 * (х+3) + 3 * (2*а+1) = ? 8 * (7 х+9) + 5 * (2*х+3) + 5=?

1) 7 * (4a + 2) + 3 * (2 * a + 1) = 7 * 4a + 7 * 2 + 3 * 2a + 3 * 1 = 28a + 14 + 6a + 3 = (28a + 6a) + (14 + 3) = 34a + 17;

2) 4 * (3 * b + 1) + 7 (6 * b + 2) = 4 * 3b + 4 * 1 + 7 * 6b + 7 * 2 = 12b + 4 + 42b + 14 = (12b + 42b) + (4 + 14) = 54b + 18;

3) 2 * (x + 3) + 3 * (2 * a + 1) = 2 * x + 2 * 3 + 3 * 2a + 3 * 1 = 2x + 6 + 6a + 3 = 2x + 6a + 9;

4) 8 * (7x + 9) + 5 * (2 * x + 3) + 5 = 8 * 7x + 8 * 9 + 5 * 2x + 5 * 3 + 5 = 56x + 72 + 10x + 15 + 5 = (56x + 10x) + (72 + 15 + 5) = 66x + 92.