1. The equation (2x + 1) - (y + 3) = x + y is transformed into a formula containing x to express y, and the corresponding values of Y are obtained when x = - 2,0.1, two fifths respectively 2. Write a group of integer solutions, a group of negative integer solutions and a group of positive integer solutions of the quadratic equation 4x-3y = 15 (add 20 points to the formula)

1. The equation (2x + 1) - (y + 3) = x + y is transformed into a formula containing x to express y, and the corresponding values of Y are obtained when x = - 2,0.1, two fifths respectively 2. Write a group of integer solutions, a group of negative integer solutions and a group of positive integer solutions of the quadratic equation 4x-3y = 15 (add 20 points to the formula)

1. (2x + 1) - (y + 3) = x + y2x + 1-y-3 = x + yx-2-y = Y2Y = x-2y = 1 / 2x-1 when x = - 2, y = 1 / 2x (- 2) - 1 = - 1-1 = - 2 when x = 0.1, y = 1 / 2x0.1-1 = 0.05-1 = 0.95 when x = 2 / 5, y = 1 / 2x2 / 5-1 = 1 / 5-1 = 4 / 52.4x-3y = 15x = 15 + 3Y / 4 when y = - 1 or y = 3, there are integer solutions y = - 1, x = 3; y = 3, x = 6

The number of a is 24 larger than that of B. the ratio of a and B is 5:3. The sum of a and B is ()
A.12 B.60 C.36 D.96

Let a be x, then B be (x-24);
The equation x: (x-24) = 5:3
X is 60
x+x-24=96

A, B and C together spent 820 yuan to buy a gift. The ratio of a and B is 5:2, and the ratio of B and C is 5:3
A. 500 yuan
B. B: 120 yuan
C. C department 200 yuan
D. The ratio of a, B and C is 5:2:3

The ratio of a and B is 5:2, the ratio of B and C is 5:3, that is, the ratio of a and B is 25:10, the ratio of B and C is 10:6, so the ratio of a, B and C is 25:10:6, so the ratio of a to B is 820 * 25 / (25 + 10 + 6) = 820 * 25 / 41 = 500 yuan, and the ratio of B to C is 820 * 10 / (25 + 10 + 6) = 820 * 10 / 41 = 200 yuan