(8十Z.4)X(0.5Z÷15.6~1D.4X0.0l6~0.|6642.5X十6=7.ZX|02.5X十6=722.5X十6-6=7Z-62.5X=662.5X÷2.5=66÷2.5X=26.4
(8+2.4)×(0.52÷15.6)=0.1072.5X+6=7.2×102.5X+6=72X=26.4