Originally posted by knptmug at 2005-4-20 09:47 PM:+ a* i5 u& N5 ~7 v2 ]2 Y
set small watermelon: x, middle watermelon y and big watermeton z 3 R1 L8 @. z) U' x ' U. N' L) X) A; T$ O" vtwo simultaneous equations are set up:2 o v- F. I- X+ R6 k2 f( M5 L% t! n
0.5x+2y+5z=50 (1)+ Q! {- I" X% X) |5 {
x+y+z=50 (2) + h0 x. R9 T# [5 eEquation(1) means that the total amount paid is equal t ...
$ N; y2 G% J1 j7 i) i7 o* W( _:lol::lol:* R8 J# k# N, i7 t. j! W
楼主的标题就是给你写的! 5 R# u ^6 R! f3 D5 e0 @你看看我们智力超群的同学们回答的都多好啊!