+ = 1- = 1.25× = - =
0.9+99×0.9= 0÷ = 1÷ = -0.5=
0.6×101= 3.2×2.5×12.5=
1÷0.25=
+1=
×24=
+=
﹣=
110×0.02=
0.32=
0.5+0.5×2=
3×﹣×2=
10÷=
莉莉家离图书馆有450米,他从家到图书馆用6分钟,从图书馆回家他每分钟走50米,莉莉来回一趟平均每分钟走多少米?