Verified answer

bonsoir

a. 1/2 + 7/5 =  5/10 + 14/10 = 19/10

b . 8/7 - 7/12  =  96/84 - 49/84 = 47/84

c. 2 /23 - 11/10 =  20/230 - 253/230 =  - 233/230

d. - 3/4 - 7/9 =  - 27/36 - 28/36 = -  55/36

Verified answer

Réponse :

Explications étape par étape

Bonsoir

a.1÷2 + 7÷5

= 1/2 + 7/5

= 5/(2 x 5) + (7 x 2)/(5 x 2)

= 5/10 + 14/10

= 19/10

= 1,9

b. 8÷7 - 7÷12

= 8/7 - 7/12

= (8 x 12)/(7 x 12) - (7 x 7)/(7 x 12)

= 96/84 - 49/84

= 47/84

c.2÷23 - 11÷10

= 2/23 - 11/10

= (2 x 10)/(23 x 10) - (11 x 23)/(10 x 23)

= 20/230 - 253/230

= -233/230

d. -3÷4 - 7÷9

= -3/4 - 7/9

= -(3 x 9)/(4 x 9) - (7 x 4)/(9 x 4)

= -27/36 - 28/36

= -55/36