Răspuns:
Explicație pas cu pas:
5 nu este clar.
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9.
a) 77(3/7 + 2/5) = 77(15/35 + 14/35) = 77*29/35 = 11*29/5 = 319/5
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b) 3(5 + 1/4 +17/16) = 3(80/16 + 4/16 + 17/16) = 3*101/16 = 303/16
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c) 7(2/5 + 3 + 12/5) = 7(2/5 + 15/5 + 12/5) = 7*29/5 = 203/5
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d) 3/19*(3/7 + 4/7) = 3/19 *7/7 = 3/19
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e) 2/23 * 3/5 (1 - 1/2) = 6/115*1/2 = 3/115
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f) 5(7/11 +3/22 - 1/2) = 5*(14/22 + 3/22 - 11/22) = 5*6/22 = 5*3/11 = 15/11
