1.25x(8.1+0.7)=1.25x(8+0.8)=1.25x8+1.25x0.8=10+1=11
1.25*（8+0.8）=1.25*8+1.25*0.8=10+1=11
1.25x(8.1+0.7）=1.25x8.8=11（请采纳）
