 鲜花( 634)  鸡蛋( 5)
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Originally posted by knptmug at 2005-4-20 09:47 PM:+ M) `( A1 U* I! T
set small watermelon: x, middle watermelon y and big watermeton z
3 h! M8 I r- S7 s2 P& K& f+ h% H0 u/ w& ~$ J
two simultaneous equations are set up:
3 W% Z/ E, u3 A2 W8 W0.5x+2y+5z=50 (1)
( C2 f; y8 b5 l2 Rx+y+z=50 (2), I$ @* P. v% m' O
Equation(1) means that the total amount paid is equal t ... ( L" ^' h3 Q/ P6 i: i
:lol::lol:
/ }' I5 E, `* I楼主的标题就是给你写的!" D, l( ], h1 U
你看看我们智力超群的同学们回答的都多好啊! |
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