Question

(1,2-1,8в+3)(-2)-5(1,2+1,86-1,3)=

Answer 1

1)1.2+3=4.2
2)(4.2-1.8в)(-2)=-4.2-1.8в)*2
3)(4.2-1.8в)*2=8.4-3.6в
4)-(8.4-3.6в)=-8.4+3.6в
5)1.2+1.86=3.06
6)3.06-1.3=1.76
7)5*1.76=8.8
8)-8.4-8.8=-17.2
Ответ:-17.2+3.6в

Answer 2

To simplify the expression (1.2 - 1.8v + 3)(-2) - 5(1.2 + 1.86 - 1.3), follow these steps:

Step 1: Distribute -2 to each term inside the first set of parentheses: (-2) * 1.2 = -2.4 (-2) * (-1.8v) = 3.6v (-2) * 3 = -6

So, the expression becomes:

-2.4 + 3.6v - 6 - 5(1.2 + 1.86 - 1.3)

Step 2: Simplify the expression inside the second set of parentheses: 1.2 + 1.86 - 1.3 = 1.76

Now, substitute this value back into the expression:

-2.4 + 3.6v - 6 - 5(1.76)

Step 3: Distribute -5 to the value inside the second set of parentheses: -5 * 1.76 = -8.8

Now, substitute this value back into the expression:

-2.4 + 3.6v - 6 - 8.8

Step 4: Combine like terms: (-2.4 - 6 - 8.8) + 3.6v

Now, add the constants:

-17.2 + 3.6v

So, the simplified expression is:

-17.2 + 3.6v