Simone
第一题：牛2眼4腿，鸡2眼2腿总共86眼 142腿~~ 设鸡冲宽数X 牛Y则 2X+2Y=86 2X+4Y=142解得X=15 Y=28 第二题：设巧旁large iron重X kg small iron重 Y kg由这句 puts one large and one small iron disc on each side of a lifting road which,by itself,weighs 6kg.Now the total mass is 150kg得2X+2Y+6=150由这句 he adds one more small iron disc on each side and yjis time, it weighs 202kg得4X+2Y+6=202解得X=26 Y=46什么有点难，国内小学生做的题都比这难散首~~~顺便说一句，这单词什么意思？？yjis？？？
