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a) 1/6 - 3/4 = 2/12 - 9/12 = - 7/12 ( - i + obok siebie dają - )
b) 7/15 + 2 1/6 = 7/15 + 13/6 = 14/30 + 65/30 = 79/30 = 2 19/30
c) 7 1/2 - 9 1/3 = 15/2 - 28/3 = 45/6 - 56/6 = -10/6 = -1 4/6 = -1 2/3
d) -10 + 4 1/5 = -10 + 4,2 = 5,8 --- inny sposób - zamieniłem ułamek zwykły na dziesiętny
Richla