 鲜花( 634)  鸡蛋( 5)
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Originally posted by knptmug at 2005-4-20 09:47 PM:
7 c+ b8 D7 p5 ^! w8 x3 \/ tset small watermelon: x, middle watermelon y and big watermeton z
8 _& u4 v0 ~9 G# J; g% c7 q5 Q, E! f- C$ e
two simultaneous equations are set up:$ b& W( z) G9 |" G& G& ?
0.5x+2y+5z=50 (1)1 O) k! W" s( [( e9 ^5 X
x+y+z=50 (2), Y( l# f9 w# {/ n2 f3 c# c$ t2 Y
Equation(1) means that the total amount paid is equal t ... 2 J1 J( s6 y1 I2 _
:lol::lol:; S' \ h, K; W. e' A% f* P
楼主的标题就是给你写的!* E& n- O; ?' e, e* D' A+ 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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