Originally posted by knptmug at 2005-4-20 09:47 PM: 8 P: i! t) \1 Lset small watermelon: x, middle watermelon y and big watermeton z ' g6 m+ R# p$ I/ f. r, k, N- h2 E* X0 s7 J9 S
two simultaneous equations are set up: % e/ x! }( q; d0.5x+2y+5z=50 (1)9 i }6 `$ B/ `& i4 ]% B
x+y+z=50 (2)7 @ T$ }& I4 U+ V! g
Equation(1) means that the total amount paid is equal t ...
/ W1 N; g& l1 [! l:lol::lol:% T* t4 h" k S7 U' |: `9 r2 o
楼主的标题就是给你写的!- N$ \% M ~9 |3 k6 f5 s. p
你看看我们智力超群的同学们回答的都多好啊!