笔算下面各题(第(1),(2)小题要求验算.)(1)408÷4=验算: (2)780÷9=验算: (3)46×7= (4)312×8= (5)803÷5=
100﹣98.2﹣1.8. 8+4.7+1+5.3 14.71﹣5﹣4.
用简便方法计算.(1)3.8+1 (2) (3)(1﹣)×26+26÷13×2.
用简便方法计算,并写出计算过程10﹣0.35﹣0.65 25×1.25×32.
计算.能简算的要简算,并写出简算过程.(1)(0.12+0.22+0.32+0.42)2÷(0.13+0.23+0.33+0.43)(2)3.97÷7+×4.03﹣(3)0.0021×[1+2.93÷(11﹣1.9)]÷0.001(4)0.125×0.25×0.5×64 (5)4936×(0.75×42.7﹣0.573×25+57.3)÷3.
888×1.125 45×0.25+36÷4+×19