Mixed operation of rational number addition and subtraction (+ 7 / 4) + (- 1 / 4) - (+ 16 / 7) - (- 16 / 7) | Math enthusiast | Mathematical art

Mixed operation of rational number addition and subtraction (+ 7 / 4) + (- 1 / 4) - (+ 16 / 7) - (- 16 / 7)

(+ 7 / 4) + (- 1 / 4) - (+ 16 / 7) - (- 16 / 7)
=7 / 4-1 / 4-16 / 7 + 16 / 7
=7-1 / 4
=6 / 4
=3 / 2

The mixed operation of addition and subtraction of rational numbers 1.13 - [26 - (- 21) + (- 18)] 2. [1.4 - (- 3.6 + 5.2) - 4.3] - (- 1.5)
Mixed operation of addition and subtraction of rational numbers
calculation
1.13-[26－﹙－21﹚＋﹙－18﹚]
2.[1.4－﹙－3.6＋5.2﹚－4.3]－﹙－1.5﹚
3. | - two and a quarter | - (- three quarters) + 1 - | - one and a half|

Hello! 1. 13 - [26 - (- 21) + (- 18)] = 13 - (26 + 21-18) = 13-29 = - 162. [1.4 - (- 3.6 + 5.2) - 4.3] - (- 1.5) = 1.4 + 3.6-5.2-4.3 + 1.5 = - 33

If one third of the sum of four rational numbers is 4, and three of them are - 12, - 6,9, then the fourth number is () A. - 2 & # 178; b.15 C. - 18 d.21

The fourth number = 4 △ 1 / 3 - (- 12-6 + 9) = 12 + 9 = 21
Choose D

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