Question

-2,8+(-1,65+(-3/4).! -8+4 3/7+2 11/21.! 2,2+(-4 1/3)+(-1 13/15)

Answer 1

-2,8+(-1,65+(-3/4)=-2,8-1,65-0,75=-5,2

-8+4 3/7+2 11/21=-8+4 9/21+2 11/21=

-1 1/21

2,2+(-4 1/3)+(-1 13/15)=2 1/5-4 1/3-

1 13/15=2 3/15-4 5/15-1 13/15=-4

Answer 2

To simplify each of these expressions, we'll need to perform addition and subtraction with mixed numbers and decimals.

-2,8+(-1,65+(-3/4)) =

First, we simplify the innermost parentheses:

-2,8+(-2,05)

Next, we combine the values, being careful to subtract the second value from the first (since it has a negative sign in front of it):

-4,85


-8+4 3/7+2 11/21 =

We first convert the mixed numbers to improper fractions:

-8 + (4*7+3)/7 + (2*21+11)/21

Simplifying the fractions:

-8 + 31/7 + 23/21

To add these fractions, we need a common denominator, which is 21:

-8 + (31*3)/(7*3) + 23/21 =

-8 + 93/21 + 23/21 =

-8 + 116/21

To convert this back to a mixed number, we divide the numerator by the denominator and express any remainder as a fraction:

-8 + 5 11/21


2,2+(-4 1/3)+(-1 13/15) =

Again, we'll convert the mixed numbers to improper fractions:

2,2 + (-4*3+1)/3 + (-1*15+13)/15 =

2,2 + (-11/3) + (-2/15)

To add these fractions, we need a common denominator, which is 15:

2,2 + (-55/15) + (-2/15) =

2,2 + (-57/15)

To convert this back to a mixed number, we divide the numerator by the denominator and express any remainder as a fraction:

2,2 - 3 12/15 =

2,2 - 3 4/5 =

-1 3/5