Originally posted by knptmug at 2005-4-20 09:47 PM:1 X9 B: _6 j' ^# i: G
set small watermelon: x, middle watermelon y and big watermeton z 3 o( c; O7 g* B! Z8 Q# n0 D% \, U. d% n
two simultaneous equations are set up:) z/ E/ @' A5 ` V/ R6 n; \/ ]
0.5x+2y+5z=50 (1)" P$ w0 r4 ]; O6 l8 _; _; o* D
x+y+z=50 (2)) l% z! O0 s0 A) O1 E( ^; z
Equation(1) means that the total amount paid is equal t ...
' _ m P1 n% C7 B% k
:lol::lol:; u- I% R. v& u+ K R+ @) {" j
楼主的标题就是给你写的! # {: _, P) |" p2 ^$ N% B你看看我们智力超群的同学们回答的都多好啊!