Sagot :
180×2/3a+180×7/4=180×3/5a-180×5/9
60×2a+45×7=36×3a-20×5
120a+315=108a-100
120a-108a=-100-315
12a=-415
a=-415/12
Bonjour
résoudre ce probleme :
2/3 a + 7/4 = 3/5 a - 5/9
2/3 a - 3/5 à = -5/9 - 7/4
10/15 a - 9/15 à = -20/36 - 63/36
1/15 a = -83/36
a = -83/36 x 15
a = -83 x 15/36
a = -83 x (5 x 3)/(12 x 3)
a = -83 x 5/12
a = -415/12