一盒饼干6元钱，乐乐付了20元，应找回几元？9d2[:U'j)@3p2y'f5c5g
算式：提示:{/M0j+u)y8r7_6c7h1L:S7T'G9d2[:U'j)@3p2y'f5c5g
答：应找回6D*f*~/a7e(X元。9d2[:U'j)@3p2y'f5c5g