Question

Calculaţi : 2*3/4 = ;1-1/5*10=;5/8*16/35=;3-1/3*0,3=;2-2/9*1-4/5= ; Va rog dau coroana urgent !!!​

Answer 1

Răspuns:

Explicație pas cu pas:

2 × ( 3/4) = (2/4) × 3 = 3/2  = 1,5

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1 - (1/5 )× 10 = 1 - 10/5 = 1 - 2 = - 1

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(5/8) × ( 16/35) = (5/35) ×(16/8) = (1/7) × 2 = 2/7

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3 - (1/3 ) × 0,3 =

= 3 - ( 1/3 ) × 3/10 =

= 3 - 1/10 =  [  amplific fractie cu 10

= 30/10 - 1/10 =

= 29/10 =

= 0,9(6)

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2 - (2/9) × 1 - 4/5 =

= 2 - 2/9 - 4/ 5 = [ aduc fractiile la acelasi numitor 45

= 90/45 - 10/45 - 36/45 =

= (80-36)/45 =

= 44/45 =

= 0,9(7)