0.5*1.02=0.5*(1+0.02)=0.5*1+0.5*0.02=0.5+0.01=0.51
0.05*0.2的竖式(带竖式,写清楚)0.05*0.2=.010
0.15*0.12+0.5 =(0.1+0.05)*0.12+0.5 =0.1*0.12+0.05*0.12+0.5 =0.012+0.006+0.5 =0.518
0.5
0.05*0.2=0.01
具体求法,如图所示
9.8*0.5=4.9 9.8 * 0.5 4.90
0.2*0.5=0.4*0.25 改成比例:0.2:0.4=0.25:0.50.2:0.25=0.4:0.5
0.5*12.5*2*0.8 =0.5*2*12.5*0.8 =1*10 =10
0.27*0.5*0.2=0.27*(0.5*0.2)=0.27*0.1=0.027