Răspuns:
Explicație pas cu pas:
3.
N + 2N = 15/2
3N = 15/2
N = 15/2 : 3 = 15/2 *1/3 = 5/2
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4.
N + 3N = 32/5
4N = 32/5
N = 32/5 : 4 = 32/5 * 1/4 = 8/5
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5.
2N + 3/2 = 12/5
2N = 12/5 - 3/2 = 24/10 - 15/10 = 9/10
N = 9/10 : 2 = 9/10 *1/2 = 9/20
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6.
3N - 33/16 = 3/8 = 6/16
3N = 33/16 + 6/16 = 39/16
N = 39/16 : 3 = 39/16 * 1/3 = 13/16