Question

3 1/4:(3/4-7/5)-2•1 3/7 решите пж

Answer 1

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Answer 2

Sure, let's solve the expression step by step:

Step 1: Simplify the expression inside the parentheses. 3/4 - 7/5

To perform the subtraction, we need a common denominator, which is 20. So:

(3/4) - (7/5) = (15/20) - (28/20) = (-13/20)

Step 2: Simplify the expression outside the parentheses. -2 * 1 3/7

To simplify, convert the mixed number to an improper fraction:

1 3/7 = (7*1 + 3)/7 = 10/7

Now, multiply by -2:

-2 * (10/7) = -20/7

Step 3: Combine the results from Step 1 and Step 2:

3 1/4 : (-13/20 - 20/7)

Step 4: Convert the mixed number to an improper fraction:

3 1/4 = (4*3 + 1)/4 = 13/4

Step 5: Divide the fractions:

(13/4) : (-13/20 - 20/7)

To divide fractions, you multiply by the reciprocal of the second fraction:

(13/4) * (-20/7 - 13/20)

Step 6: Find the common denominator:

The common denominator of 7 and 20 is 140.

Step 7: Convert the fractions to have a common denominator:

(13/4) * (-2600/140 - 91/140)

Step 8: Perform the subtraction:

(13/4) * (-2681/140)

Step 9: Simplify the result:

-34153/140

So, the final result is -34153/140.