Question

calculeaza, aducand la acelasi numitor. a) 2/3 + 5/2 b) 7/8 + 7/9 c) 1/6 + 4/30 + 1/4 d) 23/24 - 1/48 - 1/6 e) 5/18 - 2/9 + 1/3.



( "/" ) inseamna supra



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Answer 1

Răspuns:

a) 2/3 + 5/2 = (2x2 + 5x3) / 6 = (4+15) / 6 = 19/6 = 3 intregi 1/6

• numitorul comun = 6

b) 7/8 + 7/9 = (7x9 + 7x8) / 72 = (63+56) / 72 =  119/72 = 1 intreg 47/72

• numitorul comun = 72

c) 1/6 + 4/30 + 1/4 = (10 + 4x2 + 15) / 60 = 33/60 = 11/20

• numitorul comun = 60

d) 23/24 - 1/48 - 1/6 = (23x2 - 1 - 8) / 48 = 37/48

• numitorul comun = 48

e) 5/18 - 2/9 + 1/3 = (5 - 2x2 + 6) / 18 = 7/18

• numitorul comun = 18