Question

calcule
a) 1 -1/3 -1/4

b) 2/3 - 1/5 + 6/4

c) 3/5 + 4/3 - 2/4

Answer 1

a) 1 -1/3 -1/4 ==> *(12/12)
12*1 -12/3 -12/4 / 12
12 -4 -3 / 12
5/12

b) 2/3 - 1/5 + 6/4 ==> *(60/60)
60*2/3 - 60*1/5 + 60*6/4 / 60
40 - 12 +90 / 60
118/60 : (2/2) = 59/30


c) 3/5 + 4/3 - 2/4 ==> *(60/60)
12*3 + 20*4 - 15*2 / 60
36 + 80 - 30 / 60
86 / 60 = 43/30