6.49*0.22+258*0.0649+5.3*6.49+64.9*0.19=?(简算)

问题描述:

6.49*0.22+258*0.0649+5.3*6.49+64.9*0.19=?(简算)

6.49(0.22+2.58+5.3+1.9)=6.49*10=64.9