 鲜花( 634)  鸡蛋( 5)
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Originally posted by knptmug at 2005-4-20 09:47 PM:
& y1 x! }( Q% t& Tset small watermelon: x, middle watermelon y and big watermeton z
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2 E; Z; s5 H! b' ]two simultaneous equations are set up:1 x$ }! E( F& C b$ m% N# ~4 A8 P& E
0.5x+2y+5z=50 (1), q# ]1 g( b9 Z/ [1 \- g; ^2 U
x+y+z=50 (2)
5 I* E9 H% U* WEquation(1) means that the total amount paid is equal t ...
$ U, O) s5 c6 W& A! J8 F% h5 H:lol::lol:, |% V( I- l1 N. n u0 u4 G( {- c
楼主的标题就是给你写的!
8 g' `1 m* R7 z, Y" y你看看我们智力超群的同学们回答的都多好啊! |
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