A) A+B = 1/3-1/5
5-3/15 = 2/15
B) 2x-y
2*7-(-1/2)
14+1/2 = 28+2/2= 30/2 = 15
C) x²-yz
(1/2)² - 1/3 * 1/4
1/4 -1/3 * 1/4
1/4 - 1/2 = 3-1/12 = 2/12 = 1/6
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A) A+B = 1/3-1/5
5-3/15 = 2/15
B) 2x-y
2*7-(-1/2)
14+1/2 = 28+2/2= 30/2 = 15
C) x²-yz
(1/2)² - 1/3 * 1/4
1/4 -1/3 * 1/4
1/4 - 1/2 = 3-1/12 = 2/12 = 1/6