besoin d aide svp 4sur5 +3sur5 × 1sur2 _3sur4 ×(1sur5 _3sur10) 2sur3_1sur5:5sur8 merci​

bonjour

4/5 + 3/5 x 1/2 - 3/4 x ( 1 /5 - 3 /10)

=  4/5 + 3/10 - 3/4 x ( 2/10 - 3 /10)

= 4 /5 + 3/10 - 3/4 x ( - 1/10 )

= 4/5 + 3/10 + 3/40

=  32/40 + 12/40 + 3/40

=  47/40

2/3 - 1/5 : 5/8

= 2/3 - 1/5 x 8/5

= 2/3 - 8/25

= 50/70 - 24/75

= 26/75