Question

) 3(a+b) – 2ab; ) За + b – 2ab;3) 3(a – b) + 2ab;4) За – b+ 2abпри а= 1,2, b = 1,8.пж​

Answer 1

1) 3(1,2+1,8)-2*1,2*1.8=3*3-4.32=9-4.32=4.68

Answer 2

To evaluate the given expressions for different values of 'a' and 'b', let's substitute the given values and calculate the results:

1. For expression 3(a+b) - 2ab: a = 1, b = 1.8

Substituting the values: 3(1 + 1.8) - 2(1)(1.8) = 3(2.8) - 3.6 = 8.4 - 3.6 = 4.8

So, the result is 4.8.

2. For expression a + b - 2ab: a = 1, b = 1.8

Substituting the values: 1 + 1.8 - 2(1)(1.8) = 1 + 1.8 - 3.6 = 2.8 - 3.6 = -0.8

So, the result is -0.8.

3. For expression 3(a - b) + 2ab: a = 1, b = 1.8

Substituting the values: 3(1 - 1.8) + 2(1)(1.8) = 3(-0.8) + 3.6 = -2.4 + 3.6 = 1.2

So, the result is 1.2.

4. For expression a - b + 2ab: a = 1, b = 1.8

Substituting the values: 1 - 1.8 + 2(1)(1.8) = 1 - 1.8 + 3.6 = -0.8 + 3.6 = 2.8

So, the result is 2.8.

Therefore, the values of the given expressions for the given values of 'a' and 'b' are:

1. 3(a+b) - 2ab = 4.8
2. a + b - 2ab = -0.8
3. 3(a - b) + 2ab = 1.2
4. a - b + 2ab = 2.8