 鲜花( 634)  鸡蛋( 5)
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Originally posted by knptmug at 2005-4-20 09:47 PM:" \3 o8 \" E) N3 q3 [, D% D
set small watermelon: x, middle watermelon y and big watermeton z
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two simultaneous equations are set up:; v% \3 e# h6 r) [/ y
0.5x+2y+5z=50 (1), n# y L+ R& p2 M4 ^ f
x+y+z=50 (2)
z5 T7 W& p% r5 @8 T2 B6 A3 sEquation(1) means that the total amount paid is equal t ... $ k& X/ q8 \2 x, h4 t3 a' y6 {' ^
:lol::lol:
: T% R$ z% |) {& \. \; k( ~楼主的标题就是给你写的!
2 z4 r' t3 k/ P9 {* P你看看我们智力超群的同学们回答的都多好啊! |
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