Originally posted by knptmug at 2005-4-20 09:47 PM: , t4 _: C8 B& X. z% k" Bset small watermelon: x, middle watermelon y and big watermeton z 7 c* }2 n9 t2 j0 [! K. _* k& F2 e: t- H6 V$ R. h
two simultaneous equations are set up: * q/ a+ M# M6 }* a. K0.5x+2y+5z=50 (1)# i- H0 e; j2 r" \8 q. V8 f$ @
x+y+z=50 (2)$ @0 M" `( _# b
Equation(1) means that the total amount paid is equal t ...
D, c& a1 L* f( E0 F/ Y
:lol::lol:. U F1 t4 i w/ }* V1 p
楼主的标题就是给你写的!/ ]! @$ j6 o; R( E* t) m
你看看我们智力超群的同学们回答的都多好啊!