 鲜花( 634)  鸡蛋( 5)
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Originally posted by knptmug at 2005-4-20 09:47 PM:0 N$ V1 ~7 a, Q6 e1 T
set small watermelon: x, middle watermelon y and big watermeton z
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two simultaneous equations are set up:
* z* Y8 N! M' o0.5x+2y+5z=50 (1)4 {8 X3 i; f7 P! P
x+y+z=50 (2)
1 e& b P) t, h+ q! S- NEquation(1) means that the total amount paid is equal t ... ' [. p- Y7 Q* f# ?
:lol::lol:, `, d# Q$ O9 e/ ?* `
楼主的标题就是给你写的!/ ]: Z9 H/ x; y1 S
你看看我们智力超群的同学们回答的都多好啊! |
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