Question

Este urgent. D au 5 stele si coroana. ​

Answer 1

Explicație pas cu pas:

I) Intelegere

1) (2×7+1)/7 + (1×2+1)/2=

15/7+3/2= Se aduc la acelasi numitor adica 14

30/14+21/14= 51/14

2) (3×14+1)/14-(2×7+1)/7=

43/14-15/7= se aduce la acelasi numitor 14

43/14-30/14 =13/14

3) 12/13 × 26/24= se simplifica 12 cu 24, prin 12

13 cu 26, prin 13

1 × 2/2=1 × 1= 1

4) 2/3÷4/9= se efectueaza prin inmultirea primei fractii cu inversul celei de-a 2-a fractie.

2/3 × 9/4= se simplifica 2 cu 4 prin 2 si 3 cu 9 prin 3

1 × 3/2= 3/2

II) Aplicare si exersare

[( 5/9-17/4÷51/2) × 3/8 + 1/6]÷ 15/6=

[( 5/9-17/4 × 2/51) × 3/8+1/6]÷15/6=

[(5/9-17/2 × 1/51)× 3/8+1/6]÷ 15/6=

[(5/9- 17/102)×3/8+1/6]÷ 15/6=

[(5/9-1/6)×3/8+1/6]÷15/6=

[(10/18 - 3/18)×3/8+1/6]÷15/6=

(7/18×3/8+1/6)÷15/6=

(7/6×1/8+1/6)÷15/6=

(7/48+1/6)÷15/6=

( 7/48+8/48)÷15/6=

15/48÷15/6=

15/48 × 6/15=

1/8 ×1=1/8

IV Exercitii suplimentare

1) 295/13-217/13=78/13

2) 836/15-129/15+3/15-485/15=

225/15=15

3) (1×3+2)/3 -1/6 +3/8+(1×4+3)/4= aici am introdus intregii in fractie

5/3-1/6+3/8+7/4= se aduc la acelasi numitor adica 24

(40-4+9+42)/24=

87/24= 29/8 (am simplificat prin 3 )