Question

8(2a-3b+1)-2(5-3a-12b) якщо а=2,1 b=-15

Answer 1

8(2а-3b+1)-2(5-3a-12b)=16a-24b+8-10+6a+24b=22a-2=22*2,1-2=46,2-2=44,2

Answer 2

8(2*2,1 - 3*(-15) +1) - 2(5 - 3*2,1 - 12*(-15)) = 8*50,2 - 2*178,7  = 44,2

Answer 3

To evaluate the expression 8(2a-3b+1) - 2(5-3a-12b) when a = 2.1 and b = -15, we simply need to substitute these values into the expression and perform the calculations step by step.

Given: a = 2.1, b = -15

Expression: 8(2a-3b+1) - 2(5-3a-12b)

Step 1: Substitute the values of a and b into the expression: 8(2(2.1) - 3(-15) + 1) - 2(5 - 3(2.1) - 12(-15))

Step 2: Perform the calculations inside the parentheses: 8(4.2 + 45 + 1) - 2(5 - 6.3 + 180)

Step 3: Continue with the calculations inside the parentheses: 8(50.2) - 2(178.7)

Step 4: Perform the multiplication: 401.6 - 357.4

Step 5: Finally, subtract the two results: 401.6 - 357.4 = 44.2

So, when a = 2.1 and b = -15, the expression 8(2a-3b+1) - 2(5-3a-12b) evaluates to 44.2.