Réponse :
bonjour
Explications étape par étape
18/25*75/63=1350/1575=(1350÷5)/(1575÷5)=270/315=(270÷5)/(315÷5)=54/63=(54÷9)/(63÷9)=6/7
2/3÷4/5=2/3*5/4=10/12=(10÷2)/(12÷2)=5/6
3/4 * 6/7 * 4/12 = 72/336=(72÷3)/(336÷3)=24/112=(24÷8)/(112÷8)=3/14
5/6 : 10/8 =5/6*8/10=40/60=(40÷5)/(60÷5)=8/12=(8÷4)/(12÷4)=2/3
7/8 * 24/35 * 5/9 =840/2520=(840÷10)/(2520/10)=84/252=(84÷3)/(252÷3)=28/84=(28÷28)/(84÷28)=1/3
11/16÷22/32=11/16*32/22=352/352=1