请给下列竖式的积点上小数点.
用脱式计算.(除不尽时四舍五入保留两位小数)①13.7×0.25×8 ②18﹣(1.4+1.25×2.4)③(10.5+27.8)÷(5.2﹣2.5) ④4.2÷[8×(6.34﹣4.59)].
脱式计算.(能简算的要简算)7.02×1.02 1.125÷0.092001×0.54+2001×0.46 0.64×0.25+0.750.78÷26+0.5×0.02 [2.8﹣2.8×(2.8﹣2.8)]÷0.78×[1÷(3.2﹣2.95)] 33.4﹣26.465÷(2.6+4.1)
脱式计算,(能简算的要简算)25×7.6×0.8 23.7﹣3.9+6.3﹣6.1 2.5×64×1.25.1÷(1﹣0.98) 5.9×7.8+5.9×1.2+5.9 26.8×0.25﹣6.8÷4.
计算下面各题,注意运用简便方法.30.3÷[(1.3+1.2)×0.6] 0.59×7.2﹣7.2×0.39 1.25×7.4×8 1.6﹣0.2÷5×40.
递等式计算.(能简算的要简算)①2.5×3.2×1.25 ②6.06﹣3.5×0.24③60.4﹣(10+9.6÷0.4) ④2.3×3.2+2.3×6.8.