一间长方形的教室宽是5.5米,长是宽的2倍,这个长方形教室的面积是多少?
递等式计算.(能简算的要简算) 0.125×32×2.5;0.8×6.3﹣0.8×3.80.64÷0.4÷0.8.
(25+2.5)×0.41.25×7.23.75×2.9+2.9×6.25 3.25+110.4÷(3.2×2.3)2.5×54.8﹣2.5×14.86.3÷(13﹣3.15÷0.3)
递等式计算(能简便的要简便计算) 9.6÷0.4×0.258.68﹣8.68÷0.56×0.529.7÷(5.85÷0.65) 1.25×3.2×0.814.5×1024.7×4.7+4.7+4.7×4.3.
计算下面各题,能简便运算的要简便运算. ①30﹣20.6÷2 ②1.25×2.33×8 ③0.35×201.
脱式计算,能简算的要简算 4.57+3.34÷0.21.68÷0.25÷0.4 2.5×0.7+7.5×0.70.125×0.32×0.25.