1.26*0.87+12.6*0.013
=1.26*0.87+1.26*0.13
=1.26*(0.87+0.13)
=1.26*1
=1.26
1.26*0.87+12.6*0.013
=1.26*0.87+1.26*10*0.013
=1.26*0.87+1.26*0.13
=1.26*(0.87+0.13)
=1.26*1
=1.26
1.26*0.87+12.6*0.013
=12.6*0.087+12.6*0.013
=12.6*(0.087+0.013)
=12.6*0.1
=1.26
1.26*0.87+12.6*0.013=1.26*(0.87+0.13)=1.26
1.26×(0.87+0.13)