两根都是31.4米长绳子,分别围成正方形和圆,正方形和圆哪一个面积大?大多少平方米?
400﹣213.15÷10.5; 17.46﹣7.83﹣2.17+2.54; 7.5+2.5+0.6×0.4﹣3.24; 1.23×4+4.92×7+2×4.92; (10﹣9.5×0.48)+15.9÷0.75; 3.5×[6.8﹣(1.6+3.6÷0.9)].
能简算的要简算: ①9.1﹣1.2÷6﹣6.24②4.7×10.2③0.88×4.9+0.88×5.1 ④2.5×8×0.4×0.125⑤(5.63﹣1.88)×0.2 ⑥0.25×43.7×4.
脱式计算. ①6.4÷(0.3×2+0.2) ②68.1﹣77.7÷0.7×0.5 ③3.5×5.2+0.35×48 ④4.05÷0.81+2.4.
计算下面各题能简算的要简便计算. 32÷(11.08﹣1.48)×0.8 11.1×3.58+11.1×5.42﹣+ 3+﹣+.
计算下列各题,要写出主要计算过程,能简算的要用简便方法计算. ①24÷0.2×1.6②1.9×2.6+2.6×0.1③5.1+34.1÷2.2 ④0.21×99+0.21⑤88.5÷0.8÷125⑥1.85×201.