Question

Calculeaza L:
(13/5-3/5)-(4/6+7/6-5/6)+18/9=?

(1/3+2/4+3/5+4/6+5/7)x0+3/4-2/4+?

(1+4/2+9/3)-8/8=? Ajutati-ma!!!

Answer 1

Răspuns:

Explicație pas cu pas:

( 13/5 - 3/5) - ( 4/6 + 7/6 - 5/6) + 18/9 = 3

= 10/5 - (11/6 - 5/6) + 2 =

= 2 - 6/6 + 2 =

= 2 - 1 + 2 =

= 1 + 2 =

= 3

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( 1/3 + 2/4 + 3/5 + 4/6 + 5/7) × 0 + 3/4 - 2/4 = 1/4

->  observ  ca suma fractiilor din paranteza se inmulteste cu 0, astfel ca aplic proprietatea inmultirii: cand unul din factori este 0, produsul e 0; fara a calcula suma parantezei

= 0 + 3/4 - 2/4 =

= 3/4 - 2/4 =

= ( 3-2)/4 =

= 1/4

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(1 + 4/2 + 9/3) - 8/8 = 5

= (1 + 2 + 3 ) - 1 =

= 6 - 1 =

= 5

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4/2 = 4 : 2 = 2

/ -> linia de fractie