列竖式计算309×28=验算: 567÷28=验算: 7200÷40= 600×35=
直接写得数.= = = == = = (﹣)×30=
直接写出得数.14×= ×5= ×= 12×= 3×=7×= 4.8+0.82= 3﹣2.7= (+2)×9= (﹣)×2=
口算题.×= ×= ×9= ××0=+= ×11= 5﹣﹣= ×9×7=
口算×15= ×2= ×= ×= ×=1×= ×= ×34= ×= ×=×= ×= ×= ×= ×=×24= ×= ×30= 28×= ×=
直接写出得数×15= ×2= ×= ×=1×= ×= ×34= ×=×= ×= ×= ×=