用竖式计算下面各题.76×23= 24×25= 46×18=39×64= 82×54= 88×56=
用简便方法计算.(1)4.43﹣(3.55﹣2.57)(2)0.9+9.9+99.9+999.9+9999.9.
填一填.(1)(100+2)×43= ×43+ ×43(2)9×37+9×63= ×( + )(3)(100﹣25)×4= ×4﹣25× (4)a×b+a×c= ×( + )
计算下面各题.(1)1.25×16×0.25(2)0.125×3×2.4.
计算下面各题,能简算的请用简便方法计算.5.6﹣4.28+6.O9 32﹣6.34﹣3.66 2.5+3.25+0.75+7.5.
能简算的要简算.2.87+5.6﹣0.87+4.4 ×9﹣×6 420÷7÷6﹣( +)÷1999+999×999.