 鲜花( 634)  鸡蛋( 5)
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Originally posted by knptmug at 2005-4-20 09:47 PM:0 V, r- u. R/ v4 g9 F2 `0 G
set small watermelon: x, middle watermelon y and big watermeton z' }+ E# c! \: R- V) k' X
, B! w4 N. J" b* W8 E, wtwo simultaneous equations are set up:
% Q" l1 T0 N: @5 [$ ]* t0.5x+2y+5z=50 (1)
: F$ a; G' r4 _1 _! }/ W) X$ Fx+y+z=50 (2)" I- Z0 o" L) [+ M) K( J
Equation(1) means that the total amount paid is equal t ...
1 u5 O, W9 D# i' t- J! p:lol::lol:1 T' ~5 w) ^, ]& a: L: e
楼主的标题就是给你写的!
* p- M& n4 i, s! S" g你看看我们智力超群的同学们回答的都多好啊! |
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