Originally posted by knptmug at 2005-4-20 09:47 PM:+ y) z+ A+ A |, z3 d+ j4 h+ X
set small watermelon: x, middle watermelon y and big watermeton z c/ y1 k4 B/ R/ n; b3 C : v# G O9 Q8 q8 K: ]two simultaneous equations are set up: 5 c3 C2 v% W! g8 V7 \0.5x+2y+5z=50 (1) & L9 K5 q$ L3 [x+y+z=50 (2); a/ p; R% M4 r4 m: Q& V# j# f
Equation(1) means that the total amount paid is equal t ...