Question

(2в5 минус 7в10):1в4+2,1​

Answer 1

(32-7в10):1+2.1=(32-7в10)+2.1=32-7в10+2.1=34.1-7в10

=-282475214.9

Answer 2

To solve the expression, let's follow the order of operations (PEMDAS/BODMAS - Parentheses/Brackets, Exponents/Orders, Multiplication/Division, Addition/Subtraction):

Step 1: Simplify the expression inside the parentheses first: 2/5 - 7/10 = 2/5 - 1/2 = (4/10) - (5/10) = -1/10

Step 2: Divide the result from Step 1 by 1/4: (-1/10) ÷ (1/4) = (-1/10) × (4/1) = -4/10 = -2/5

Step 3: Add 2.1 to the result from Step 2: -2/5 + 2.1 = 2.1 - 2/5

To add these numbers, we need a common denominator. The common denominator is 5. So:

(2.1 × 5)/5 - (2/5) = 10.5/5 - 2/5 = (10.5 - 2)/5 = 8.5/5

Therefore, the final result is 8.5/5, which can also be written as 1.7.

So, (2в5 - 7в10) ÷ (1в4 + 2.1) = 1.7