Question

4{5-3a]-8[2a+5} при a =0,5

Answer 1

Такое работает только если там стоят круглые скобки

Answer 2

To find the value of the expression 4{5-3a]-8[2a+5} when a = 0.5, we need to substitute the value of 'a' into the expression and perform the operations in the correct order of operations (PEMDAS - Parentheses, Exponents, Multiplication/Division, Addition/Subtraction).

Given expression: 4{5-3a]-8[2a+5}

Step 1: Substitute the value of 'a' into the expression a = 0.5

4{5 - 3(0.5)] - 8[2(0.5) + 5}

Step 2: Simplify the expression inside the parentheses and brackets

4{5 - 1.5} - 8[1 + 5]

Step 3: Perform the operations inside the brackets and parentheses

4{3.5} - 8[6]

Step 4: Perform the multiplication

4 * 3.5 - 8 * 6

Step 5: Perform the subtraction

14 - 48

Step 6: Final result

-34

Therefore, when a = 0.5, the value of the expression 4{5-3a]-8[2a+5} is -34.