Verified answer

Réponse :

bonjour

Explications :

a)8-2x(3-2x5)

8-2x(3-10)

8-2x-7

8+14

22

b) 4-2x(-4)+6÷2

4-2x(-4)+3

4+8+3

15

c)8-2x5+2x((-2)-3)

8-10+2x(-5)

8-10-10

-12

d)(8-2)x(-3)-2x((-1)-6)

6x(-3)-2x(-7)

-18+14

-4

e)2/7-5/3x27/35

5/3x27/35=135/105=(27x5)/(21x5)=27/21=(3x9)/(7x3)=9/7

2/7-9/7=-7/7=-1

f)5/8+9/25÷18/15

5/8+9/25x15/18

9/25x15/18=135/450=(27x5)/(90x5)=27/90=(3x9)/(10x9)=3/10

5/8+3/10=(5x5)/(8x5)+(3x4)/(10x4)=25/40+12/40=37/40

g)2/7-5/3=(2x3)/7x3)-(5x7)/(3x7)=6/21-35/21=-29/21

h)1/4+3/5=(1x5)/(5x4)+(3x4)/(5x4)=5/20+12/20=17/20

i)5/36x9/25=45/900=(9x5)/(180x5)=9/180=(9x1)/(20x9)=1/20

j)3/8÷4/5=3/8x5/4=15/32