Question

3 (а-б)-2(а+б)=?4 (х+у)+5 (2х-у)=?2,4 (с-3d)-1,3 (2с-d)=?-3/4 (1/3m+n)-1/4 (3m+n)=?

Answer 1

1) 3а - 3б - 2а - 2б = а - б
2) 4х + 4у + 10х - 5у = 14х - у
3) 2,4с - 7,2d - 2,6c + 1,3d = - 0,2c - 8,5d
4) - 1/4m - 3/4n - 3/4m - 1/4n = - 4/4m (Можно записать как -m) - 4/4n (можно записать как -n)= -m - n

Answer 2

Let's solve each expression step by step:

1. 3(a - b) - 2(a + b)

Expand the terms: 3a - 3b - 2a - 2b

Combine like terms: (3a - 2a) + (-3b - 2b) a - 5b

So, 3(a - b) - 2(a + b) simplifies to "a - 5b".

2. 4(x + y) + 5(2x - y) = 2.4

Expand the terms: 4x + 4y + 10x - 5y = 2.4

Combine like terms: (4x + 10x) + (4y - 5y) 14x - y = 2.4

So, 4(x + y) + 5(2x - y) = 2.4 simplifies to "14x - y = 2.4".

3. 2.4(c - 3d) - 1.3(2c - d) = ?

Expand the terms: 2.4c - 7.2d - 2.6c + 1.3d = ?

Combine like terms: (2.4c - 2.6c) + (-7.2d + 1.3d) -0.2c - 5.9d = ?

So, 2.4(c - 3d) - 1.3(2c - d) simplifies to "-0.2c - 5.9d".

4. -3/4(1/3m + n) - 1/4(3m + n) = ?

Distribute the fractions: -3/12m - 3/4n - 3/4m - 1/4n = ?

Combine like terms: (-3/12m - 3/4m) + (-3/4n - 1/4n) -1/3m - 1n = -1/3m - n

So, -3/4(1/3m + n) - 1/4(3m + n) simplifies to "-1/3m - n".