2头猪换4只羊，1只羊换4只兔，4只羊换几只兔？1头猪换几只兔？:i8R2m*J/c4X0J-b;m
算式：提示9Q7u+A)],^(m:i8R2m*J/c4X0J-b;m
答：4只羊换;`0I+`*t9u只兔。:i8R2m*J/c4X0J-b;m
算式：提示4x6S+X7U(r(m+U*e2f1Z;`,W3M;q:o:i8R2m*J/c4X0J-b;m
答：1头猪换7A1b,A)\-s2l(w4Y只兔。:i8R2m*J/c4X0J-b;m