数360的约数有多少个?这些约数的和是多少?
选择合适的方法计算①7.8÷0.26÷0.3 ②5.4+4.6÷0.2 ③1.43×2.5+0.57×2.5 ④10.8÷0.27×4.
计算下面各题,怎样简便就怎样算.(1)45.36÷7.2﹣2.5×0.2 (2)5.12﹣(4.65﹣4.88)(3)2.7÷4+6.3×0.5 (4)9.43×1.1(5)0.25×12.5×3.2 (6)30.8×0.35+6.5×3.08.
计算:7.5×46.7+52.3×7.5+7.5; (++﹣)×24; (2.5﹣2.5×0.6)÷0.4; ﹣(+2.4×)÷; 1.2+[2÷(2﹣2.4×)]; =.
脱式计算.①2.7+3.1+2.9+3.2 ②0.44×8.3+8.3×0.56③12.53﹣1.35×2﹣9.3 ④25×32×0.5.
能简便的要简便:(1)[10﹣(8.4﹣5)]÷0.5(2)14.2×0.7+0.3×14.2(3)5.7×(3.6+6.4)(4)7.2÷4.5÷2(5)0.8×9×200.6+7×0.4×200.6.