6583 MÉMOIRES DE L'ACADÉMIE ROYALE 
Soit 
dm dM dm 4dM 
— —— — —— —= mM, 
dy dx dx d'y 
dm dM dm dM 
a on a lnrer de (rt 249 
t } 34 t 
dm dM dm d4M 
d:7 dx ROUTE EN TEE Cu M], 
& ainfi des autres quantités femblables, nous aurons 
28 dK TBE MZ + (m1 M + mMi)Z 
+ m2M + miM:s + mM2 + (m3 M 
+ m2Mi+miM2+mM3)2 + (m4M 
+ m3Mi+m2M2+miM3+mMa4) Z* 
UC. 
RE — (mM)E + [(mx M) 
+ MAT Z + (m2M) + (m1 M1) 
+ (mM2) + [(m3 M) + (m2Mi) 
+ (miM2) + (mM3)]27° + [(u4M) 
cr (te 2 ARE L Cr (ie FAR AL MERS 
+ (mMa4)] 27° + &c 
= [M] LE + ([m: M] 
+ [mMi])Z + [m2 M] + [ui Mi] 
+. {uM2] + ([m3 M] + [m2 Mail 
+ [mi M2] + [mM3])2Z 7° + (na MI] 
+ [m3 Mi] + [m2 M2] + [ui M3] 
+ [nmMa])ZTi + &e 
