Bonsoir
Calculer et simplifier :
A = 81/70 x 25/18
A = (9 x 9 x 5 x 5)/(7 x 2 x 5 x 2 x 9)
A = (45 x 45)/(45 x 28)
A = 45/28
B = 98/25 x 5/6
B = (2 x 49 x 5)/(5 x 5 x 2 x 3)
B = (10 x 49)/(10 x 15)
B = 49/15
2) simplifier :
315/270
= (5 x 7 x 9)/(5 x 6 x 9)
= (45 x 7)/(45 x 6)
= 7/6
(2021 + 2021)/(2021 + 2021 + 2021 + 2021 + 2021 + 2021)
= (2 x 2021)/(6 x 2021)
= 2/6
= 2/(2 x 3)
= 1/3
Trouver x tel que 2/3 = x/5 :
x = (2 * 5)/3
x = 10/3
