Question

1)3 (a+4)+4 (a-3) 2)2 (b+7)-3 (b+1) 3)8 (c-3)+5(c+4) 4)2,4 (d+1)-0,6 (4d-3)

Answer 1

1) 3а+12+4а-12=7а
2)2b+14-3b-3=11-b
3)8c-24+5c+20=13c-4
4)2.4d+2.4-2.4d+1.8=4.2

Answer 2

1) 3a+12+4a-12=3a+4a=7a
2) 2b+14-3b-3=11-b
3) 8c-24+5c+20=13c-4
4) 2,4d+2,4-2,4d+1,8=4,2

Answer 3

Let's simplify the given expressions:

1. 3(a + 4) + 4(a - 3)

Expand the parentheses:

= 3a + 12 + 4a - 12

Combine like terms:

= 7a

So, the simplified expression is 7a.

2. 2(b + 7) - 3(b + 1)

Expand the parentheses:

= 2b + 14 - 3b - 3

Combine like terms:

= -b + 11

So, the simplified expression is -b + 11.

3. 8(c - 3) + 5(c + 4)

Expand the parentheses:

= 8c - 24 + 5c + 20

Combine like terms:

= 13c - 4

So, the simplified expression is 13c - 4.

4. 2.4(d + 1) - 0.6(4d - 3)

Expand the parentheses:

= 2.4d + 2.4 - 2.4(4d) + 1.8

Simplify the decimals:

= 2.4d + 2.4 - 9.6d + 1.8

Combine like terms:

= (2.4d - 9.6d) + (2.4 + 1.8)

= -7.2d + 4.2

So, the simplified expression is -7.2d + 4.2.