cost 15 to make the shoes, gave the boy 29 for change, and need 29 more to pay back the nieghborhood, so 15+29+29= 73. simple ,math problem. much easier than calculus~2 @3 x( f8 \5 \
9 R9 V2 x% e4 u% m1 b" P) c0 ]os.tvboxnow.com[ 本帖最後由 carsonchan 於 2009-2-15 04:18 PM 編輯 ] |