1.24×4.6+0.75=(1+0.2+0.04)×4.6+0.75=1×4.6+0.2×4.6+0.04×4.6+0.75=4.6+0.92+(0.184+0.75)=4.6+1-0.08+0.934=5.6-0.08+1-0.066=6.6-0.146=6.454
