Répondre :
a) x + 7 = 10 <=> x = 10 - 7 <=> x = 3
b) a - 8 = 13 <=> a = 13 + 8 <=> a = 21
c) 5y = 4 <=> y = 4/5 <=> y = 0,8
d) +4 = 9 >= 41y <=> 4 - 9 >= 41y <=> -5 >= 41y <=> -5/41 >= y <=> 0,12 >= y (arrondi au dixième près)
a) x + 7 = 10 <=> x = 10 - 7 <=> x = 3
b) a - 8 = 13 <=> a = 13 + 8 <=> a = 21
c) 5y = 4 <=> y = 4/5 <=> y = 0,8
d) +4 = 9 >= 41y <=> 4 - 9 >= 41y <=> -5 >= 41y <=> -5/41 >= y <=> 0,12 >= y (arrondi au dixième près)