Question

А) -39 + 42 б) -17 - 20 в) 28 - 35 г) -16 - (-10) д) 4.3 - 6.2 е) -7/9 - 1/6

Answer 1

А) -39 + 42 =3
б) -17 - 20=-37
в) 28 - 35=-7
г) -16 - (-10) =-16+10=-6
д) 4.3 - 6.2 =-1.9
е) -7/9 - 1/6=-14/18-3/1=-17/18

Answer 2

А) 3
Б) -37
В) -7
Г) -6
Д) -1.9
Е) -17/18

Answer 3

Let's solve the given arithmetic expressions:

а) -39 + 42 To add these numbers, simply add their magnitudes and then apply the sign of the larger number: -39 + 42 = 3

б) -17 - 20 To subtract these numbers, apply the rule: a - b = a + (-b) -17 - 20 = -37

в) 28 - 35 Subtract the numbers: 28 - 35 = -7

г) -16 - (-10) When subtracting a negative number, it's like adding its positive counterpart: -16 - (-10) = -16 + 10 = -6

д) 4.3 - 6.2 Subtract the numbers: 4.3 - 6.2 = -1.9

е) -7/9 - 1/6 To subtract fractions, you need to find a common denominator, which is the least common multiple (LCM) of the denominators. In this case, the LCM of 9 and 6 is 18. Then, rewrite both fractions with a denominator of 18 and perform the subtraction: -7/9 - 1/6 = -14/18 - 3/18 = -17/18

So, the results are: а) -39 + 42 = 3 б) -17 - 20 = -37 в) 28 - 35 = -7 г) -16 - (-10) = -6 д) 4.3 - 6.2 = -1.9 е) -7/9 - 1/6 = -17/18