脱式计算:0.75÷0.25+× (8.6×0.5﹣)÷12 ÷[﹣(+)] [800×(1+25%)﹣360×1.5]÷25% 15﹣[+(2.5﹣)]÷0.125.
用简便方法计算. 7.2﹣3.42﹣1.588.27+3.7+0.73+6.315.4﹣(5.4+2.3) 8.35+3.8﹣2.3527.4﹣1.8+12.6﹣5.2 23×98.
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.