0.88x4.8+0.88x5.2=0.88x(4.8+5.2)=0.88x10=8.8
0.88x4.8+0.88x5.2=0.88x(4.8+5.2)=0.88x10=8.8-------------------------------
0.88×(4.8+5.2)=8.8