3.98+2.567 6.5吨650千克 3.6×1.40.36×14
45×0.8945 630×1.01630 7米5厘米7.5米
①3.75×1.43.75 ②0.52×8.328.32
③4.26×14.26 ④2.84×1.031.72×2.84
1.92×0.9=
8.6+12.97= 20-17.26=
3.2×5.14= 6.84×700=