Răspuns:
Explicație pas cu pas:
a)
√(1/49) = √1/√49 = 1/7
√(1/16) =√1/√16 = 1/4
1/7 + 1/4 = 4/28 + 7/28 = 11/28
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b)
1/5 - 1/6 = 6/30 - 5/30 = 1/30
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c)
1/4 + 1/6 = 3/12 + 2/12 = 5/12
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d)
7/8 - 5/12 = 21/24 - 10/24 = 11/24
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e)
9/5 - 3/10 = 18/10 - 3/10 = 15/10 = 3/2
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f)
9/20 + 4/5 = 9/20 + 16/20 = 25/20 = 5/4