递等式计算;F5R(p6k3S,d)P7I6p+u6^2t
6.8×0.56＋0.44×6.8;F5R(p6k3S,d)P7I6p+u6^2t
算式：提示/L.[/D-l0k:\9d6F;F5R(p6k3S,d)P7I6p+u6^2t
=;D0h,P0H)b)^,Y8r6N,a3Z;F5R(p6k3S,d)P7I6p+u6^2t