Réponse :
Explications étape par étape :
bonjour
a) 8-2×(3-2×5) = 8 - 2× (3 - 10) = 8 - 2 × (-7) = 8 + 14 = 22
b) 4-2×(-4)+6÷2= 4 + 8 + 3 = 15
c) 8-3×5+2×((-2)-3)= 8 - 15 + 2 × (-5) = - 7 - 10 = - 17
d) (8-2)×(-3)-2×((-1)-6)= 6×(-3) - 2× (-7) = - 18 + 14 = - 4
e) 2/7-5/4×27/35= 2/7 - (5×27)/(4×35) = 2/7 - (5×27)/(4×7×5) = 2/7 - (27/28) = 8/27 - 27 /28 = -19/28
f)5/8+9/25÷18/15= 5/8 + 9/25 × 15/18 = 5/8 + (9×15)/(25×8) = 5/8 + (9×3×5)/(5×5×8) = 5/8 + 27/40 = 25/40 +27/40 = 52/40 = 13/10
g)2/7-5/3= 6/21 -35/21 = - 29/21
h)1/4+3/5= 5/20 + 12/20= 17/20
i)5/36×9/25= (5×9) /(36×25) = (5×9) /(4×9×5×5) = 1/20
j)3/8÷4/5= 3/8 × 5/4 = 15/32