Originally posted by knptmug at 2005-4-20 09:47 PM:2 w: {3 C0 C4 d( h0 K* Z0 {
set small watermelon: x, middle watermelon y and big watermeton z. T: h7 ^1 C8 W: e) H5 L* C o0 B: U
3 a/ W1 g" |4 R5 P$ J" t( Etwo simultaneous equations are set up: e/ b$ |( e6 j
0.5x+2y+5z=50 (1)( W) l% \9 Y; s9 P. I5 S4 C) c
x+y+z=50 (2) 5 X. }* `! O# V7 E: ^' ^1 K6 J2 LEquation(1) means that the total amount paid is equal t ...
+ z( R% _- Y2 t* } }2 _/ N0 J:lol::lol:; W2 X& N" k, n, o0 [
楼主的标题就是给你写的! 9 X* R% k' V a5 L& {5 R你看看我们智力超群的同学们回答的都多好啊!