 鲜花( 634)  鸡蛋( 5)
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Originally posted by knptmug at 2005-4-20 09:47 PM:) x/ a I& P7 G+ D
set small watermelon: x, middle watermelon y and big watermeton z
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two simultaneous equations are set up:
' `0 v+ O' x+ C6 d* C: R0.5x+2y+5z=50 (1)
% l3 j8 g7 h$ d$ h; Rx+y+z=50 (2)
/ x d! x% B; o/ Q0 ^4 UEquation(1) means that the total amount paid is equal t ...
( @7 W( f, r3 a. ?, ~% j0 J:lol::lol:
1 n+ {2 F8 z, [, D2 B2 Q' ]. ~楼主的标题就是给你写的!4 S2 U7 e: T1 K7 V7 N& @
你看看我们智力超群的同学们回答的都多好啊! |
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