=9.8*3.6+3.6*2*0.1=3.6*(9.8+0.2)=3.6*10=36
9.8*3.6+3.6*2*0.1=3.6*(9.8+0.2)=36
7.2*0.1=3.6*2*0.1=3.6*0.2原式=3.6*10=36