Question

3(а-b)-2(a+b) 2)4(х+у)+5(2х-у) 3)2,4(с-3d)-1,3(2c-d) 4)-3/4(1/3m+n)-1/4(3m+n) РЕШИТЕ ПОЖАЛУЙСТА!

Answer 1

3(а-b)-2(a+b) =3а-3б-2а-2б=а-5б
2)4(х+у)+5(2х-у) =4х+4у+10х-5у=14х-у
3)2,4(с-3d)-1,3(2c-d) =2.4с-7.2d-3.6c+1.3d=-1.2c-5.9d
4)-3/4(1/3m+n)-1/4(3m+n)=-1/4m-3/4n-3/4m-1/4n=-m-n

Answer 2

1. 3(a - b) - 2(a + b) = 3a - 3b - 2a - 2b // Distribute the negative sign = (3a - 2a) + (-3b - 2b) // Group like terms = a - 5b

2. 4(x + y) + 5(2x - y) = 4x + 4y + 10x - 5y // Distribute the multiplication = (4x + 10x) + (4y - 5y) // Group like terms = 14x - y

3. 2.4(c - 3d) - 1.3(2c - d) = 2.4c - 7.2d - 2.6c + 1.3d // Distribute the multiplication and the negative sign = (2.4c - 2.6c) + (-7.2d + 1.3d) // Group like terms = -0.2c - 5.9d

4. -3/4(1/3m + n) - 1/4(3m + n) = (-3/4 * 1/3m) - (-3/4 * n) - (1/4 * 3m) - (1/4 * n) // Distribute the multiplication and the negative signs = (-1/4m) - (1/2n) // Combine like terms

Therefore, the simplified expressions are:

1. a - 5b
2. 14x - y
3. -0.2c - 5.9d
4. -1/4m - 1/2n