Question

Помогите пожалуйста , Вычислите : 1 ) - 1,5 - 3 целых 4\5 - 8 целых 3\20 2 ) - 2 целых 5\8 - 9 , 25 - 3\4

Answer 1

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Answer 2

-1.5 - 3 4/5 - 8 3/20

To perform this calculation, we need to first convert all the mixed fractions to improper fractions, and then find a common denominator.

-1.5 can be written as -3/2.

3 4/5 can be written as 19/5.

8 3/20 can be written as 163/20.

So, the expression becomes:

-3/2 - 19/5 - 163/20

To find a common denominator, we can multiply the first fraction by 20/20, the second fraction by 4/4, and the third fraction by 1/1:

-30/40 - 76/20 - 163/20

Now we can combine the numerators:

-30 - 76 - 163 = -269

And simplify the denominator:

-269/20

Therefore,

-1.5 - 3 4/5 - 8 3/20 = -269/20

• 2 5/8 - 9.25 + 3/4

To perform this calculation, we need to first convert the mixed fraction to an improper fraction.

-2 5/8 can be written as -21/8.

So, the expression becomes:

-21/8 - 9.25 + 3/4

To add the fractions, we need to find a common denominator. Since the denominators are 8 and 4, we can simply multiply the second fraction by 2/2:

-21/8 - 18.5/2 + 3/4

Now we can combine the numerators:

-21/8 - 37/4 + 3/4 = -21/8 - 34/4

To find a common denominator, we can multiply the first fraction by 4/4:

-21/8 - 68/8

Now we can combine the numerators:

-89/8

Therefore,

-2 5/8 - 9.25 + 3/4 = -89/8