Originally posted by knptmug at 2005-4-20 09:47 PM:% ^- `9 h; A* Z" n6 i6 W% P
set small watermelon: x, middle watermelon y and big watermeton z- j. F9 i4 ]4 V n' [9 r) R
' V" l. u' _7 etwo simultaneous equations are set up: 0 _+ R! \4 ^; {* o& _/ G# O2 F0.5x+2y+5z=50 (1)+ l+ f$ `" e$ y% T/ M% I9 ?9 z
x+y+z=50 (2) 7 x, h# Q- }" X6 g4 N! \3 M( J# pEquation(1) means that the total amount paid is equal t ...
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:lol::lol:" y7 O0 T: r+ x# v1 y$ U s5 i
楼主的标题就是给你写的!# i# q' L7 ]4 |/ K2 @$ V3 `
你看看我们智力超群的同学们回答的都多好啊!