Question

21:(3 2/5+1 3/5)+(6,7-2 2/3)*2

Answer 1

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Answer 2

To solve the expression 21:(3 2/5 + 1 3/5) + (6.7 - 2 2/3) * 2, we need to follow the order of operations, which is commonly referred to as PEMDAS (Parentheses, Exponents, Multiplication and Division from left to right, Addition and Subtraction from left to right).

Let's break down the expression step by step:

Step 1: Evaluate the addition inside the parentheses: 3 2/5 + 1 3/5 = (3 + 1) + (2/5 + 3/5) = 4 + 5/5 = 4 + 1 = 5.

Step 2: Simplify the subtraction inside the parentheses: 6.7 - 2 2/3 = 6.7 - (2 + 2/3) = 6.7 - (2 * 3/3 + 2/3) = 6.7 - (6/3 + 2/3) = 6.7 - (8/3) = 6.7 - 2.6667 ≈ 4.0333.

Step 3: Perform multiplication: (4.0333) * 2 = 8.0666.

Step 4: Evaluate division: 21:(5) = 21 / 5 = 4.2.

Step 5: Perform addition: 4.2 + 8.0666 = 12.2666.

Therefore, the value of the expression 21:(3 2/5 + 1 3/5) + (6.7 - 2 2/3) * 2 is approximately 12.2666.