Question

С+д-8,3 при с= -9 4/5 д= - 1 9/20

Answer 1

-9 4/5+(- 1 9/20)-8,3=-49/5-29/20-8,3=-49*4/20-29/20-8,3=-196/20-29/20-8,3=-225/20-8,3=-225/20-83/10=-225/20-166/20=-391/20=-19 11/20

Answer 2

To evaluate the expression C + D - 8.3 with C = -9 4/5 and D = -1 9/20, we first need to convert the mixed numbers to improper fractions:

C = -9 4/5 = -(95+4)/5 = -49/5 D = -1 9/20 = -(120+9)/20 = -29/20

Substituting these values into the expression, we get:

C + D - 8.3 = (-49/5) + (-29/20) - 8.3

To simplify this expression, we need to find a common denominator for the two fractions:

• The denominator of -49/5 is already 5.
• To get a denominator of 20 for -29/20, we need to multiply both the numerator and denominator by 4: (-29/20) = (-294)/(204) = -116/80.

Now we can combine the two fractions with a common denominator of 5*4 = 20:

C + D - 8.3 = (-49/5) + (-116/80) - 8.3 = (-784/80) + (-116/80) - 8.3 = (-900/80) - 8.3 = -11.275

Therefore, when C = -9 4/5 and D = -1 9/20, the value of C + D - 8.3 is -11.275.