设懒洋洋的年龄为X岁,美羊羊则为4X岁,喜羊羊为4X+2. X-3+4X-3+4X+2-3=56 X+4X+4X=56+3+3-2+3 9X=63 X=7 7+7+7+7=28 28+2=30 \ 答：懒羊羊7岁,美羊羊28岁喜羊羊30岁
