带★的要验算496×8= 505×6= 740×7=60÷9= ★97+638= ★903﹣345=
699+736+101+364.
怎样简便就怎样算:××2442×(﹣)(+)××﹣×.
252+318+248+82.
简便计算 ①(++)×68 ②4.65﹣1.37﹣2.63.
计算,能用简便方法的用简便方法. 101×5.80.25×12.8×0.4 0.27×7.2+0.27×2.82.35×0.15﹣0.15×0.35.