直接写得数720×490÷9÷8= = = = = 5600÷(700÷25)=12×(7﹣5)= 898+6÷7÷9×21= 144÷2.4+144÷3.6=2+99+999+9999+99999=
689+194624﹣297785﹣184﹣216 451﹣202234+187+66563﹣(263+154)
简便计算:4×77+8×99.
简便计算. 44×0.25×+×(+﹣)÷.
计算下面各题,能简便的要简便运算 34×99+344.83﹣2.56+15.17(40+8)×2568×29+32×29 17.68﹣(4.68+7.2) 102×45(280÷4+15)×2 480÷(35﹣19)×17.
用简便方法计算..