Originally posted by knptmug at 2005-4-20 09:47 PM:& a- s# q( ]0 j( f7 v& s! p
set small watermelon: x, middle watermelon y and big watermeton z. T/ ?* `1 g* X4 @, B4 H Z
7 c9 s* P( B* x+ `5 vtwo simultaneous equations are set up:: Y$ Q) T* X9 z" h
0.5x+2y+5z=50 (1), T7 @% ?# }4 d: p% c% Q1 Q
x+y+z=50 (2); r' j1 h2 C) W/ \- x$ w* v7 [
Equation(1) means that the total amount paid is equal t ...
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:lol::lol:; D4 X' A; o0 u- B
楼主的标题就是给你写的!' ]3 H1 G9 P0 e E
你看看我们智力超群的同学们回答的都多好啊!