Question

5 si 6 va rog .... ​

Answer 1

Răspuns:

Explicație pas cu pas:...................................

Answer 2

Răspuns:

Explicație pas cu pas:

5)

( 2√6 ) × ( √8 + √18 ) + ( 3√15 ) : ( √45 - 3√20 ) = 19√3

= ( 2√6 ) × ( 2√2 + 3√2 ) + ( 3√15 ) : ( 3√5 -3 × 2√5 ) =

= ( 2√6 ) × ( 5√2 ) + ( 3√15 ) : ( - 3√5 ) =

= 10√12 + 3√15 × ( - 1 / 3√5 ) =

= 10 × 2√3 + 3√5 × √3 × ( - 1 / 3√5 ) =

= 20√3 - √3 =

= 19√3

______________________________________________

6)

a = ( 2 / √3 - 3 /2√3  + 1 /3√3 ) : ( 5 /√3 )

a = ( 2 - 3 / 2 + 1 / 3 ) × ( 1 /√3 ) × ( √3 / 5 )

a = ( 12 / 6 - 9 / 6 + 2 / 3 ) × (1 / 5)

a = ( 5 / 6 ) × ( 1 / 5 )

a = 1 / 6

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a⁻¹ = ( 1 / 6)⁻¹ = 1 / ( 1 / 6 )¹ = 1 : ( 1 / 6 ) = 1 x 6 / 1 = 6 ∈ N