(3/4-1/2)•5 б) (5/7+1/21):2

Question

(3/4-1/2)•5 б) (5/7+1/21):2

Answer 1

а) =1,25

б) =8/21

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Answer 2

(3/4-1/2)×5=(3/4-2/4)×5=1/4×5=5/4=1 5/4
б)(5/7+1/21):2=(15/21+1/21):2=16/21:2=16/42