脱式计算,能简算的必须简算.12.5×0.25×320 4.57×0.36+4.57×0.64 103×2.478.6÷12.5÷0.8 48×0.25×5 15.72÷(3.8﹣3.2×0.75)
笔算下面各题.286﹣87= 40÷8= 467+533= 802×5= 320×8=
用递等式计算.672÷(3×2) (85+776)÷7
从888中减去44,差再除以4,商是多少?
计算.105÷7+18 520÷(45÷9)512﹣112÷4 (603﹣246)÷7.
15除129与231的和,商是多少?