甲、乙两同学的分数比是5:4.如果甲少得22.5分,乙多得22.5分,则他们的分数比是5:7.甲、乙原来各得多少分?
用你喜欢的方法计算.7×12.5×0.8 4.7×3.6+4.7×6.4 1.45×[(2.8+4.4)÷2.4].
递等式计算:(能简算的要简算)①0.125×9×8×0.3 ②4.62÷5÷0.66③5.78×2.3+5.78+5.78×6.7 ④7.75×[20÷(3.24﹣3.04)].
用递等式计算.(能简算的要写出简算过程)(1)8.5×[(2.36+2.42)÷0.25] (2)3.9÷[(1.3+0.6)×6﹣3.6] (3)4.25×6.3+3.7×4.25(4)205×0.99 (5)25.6﹣7.49﹣2.51 (6)[2.5﹣(6.8﹣4.9)]×0.8.
口算:420÷60= 1﹣0.1= 99×9.9×0= 1.09+0.91= 4.35×10=30×80= 4.2÷21= 2.5×1.9×4= 88+104+96= 67÷10=
计算下列各题,能简算的用简便方法计算.26﹣3.17﹣7.83 67×38+33×38 125×25×6429.38﹣(19.38﹣4.76) 329×87﹣87×29 5.8﹣3.62﹣0.38+0.2.