Question

2) 3a + b - 2ab;3) 3(a - b) + 2ab;4) 3a-b+ 2abnpu a=1,2, b= 1,8. ​

Answer 1

Ответ:

3*1,2+1,8-2*1,2*1,8=5,4-4,32=1,08

3*1,2-3*1,8+2*1,2*1,8=-1,8+4,32=2,52

3*1,2-1,8+2*1,2*1,8=1,8+4,32=6,12

Объяснение:

Вроде так. Типо просто вместо а и b ставишь числа

В 3 примере надо открыть скобки

Answer 2

To evaluate the given expressions with specific values for 'a' and 'b', let's substitute the given values and perform the calculations.

2. 3a + b - 2ab:

Substituting a = 1 and b = 8: 3(1) + 8 - 2(1)(8) = 3 + 8 - 2(8) = 3 + 8 - 16 = 11 - 16 = -5

Therefore, when a = 1 and b = 8, the value of the expression 3a + b - 2ab is -5.

3. 3(a - b) + 2ab:

Substituting a = 1 and b = 8: 3(1 - 8) + 2(1)(8) = 3(-7) + 2(8) = -21 + 16 = -5

Therefore, when a = 1 and b = 8, the value of the expression 3(a - b) + 2ab is -5.

4. 3a - b + 2ab:

Substituting a = 1 and b = 8: 3(1) - 8 + 2(1)(8) = 3 - 8 + 2(8) = 3 - 8 + 16 = 11

Therefore, when a = 1 and b = 8, the value of the expression 3a - b + 2ab is 11.

Note: In the fourth expression, you mentioned "2abnpu" at the end, but it seems to be a typo as it doesn't fit with the rest of the expression. I assumed it was a mistake and excluded it from the calculation.