Question

Pune paranteze pentru a obtine rezultatele: A) 3x1+2x4+1=30. B) 3x1+2x4+1=28 C) 3x1+2x4+1=37. D) 3x1+2x4+1=21

Answer 1

Răspuns:

Explicație pas cu pas:

a)  

3 × ( 1 + 2 × 4 + 1 ) = 30

= 3 × ( 1 + 8 + 1 ) =

= 3 × 10 =

= 30

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b)  3 × ( 1 + 2 × 4 ) + 1 = 28

= 3 × ( 1 + 8 ) + 1 =

= 3 × 9 + 1 =

= 27 + 1 =

= 28

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c)  3 × ( 1 + 2) × 4 + 1 = 37

= 3 × 3 × 4 + 1 =

= 9 × 4 + 1 =

= 36 + 1 =

= 37

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d)  ( 3×1 + 2 ) × 4 + 1 = 21

= ( 3 + 2 ) × 4 + 1 =

= 5 × 4 + 1 =

= 20 + 1 =

= 21