用递等式计算,能简算的要简算14×75﹣624÷39 (7.6﹣3.6÷2)×1.5 ÷+×++6.875+ ÷(﹣)× 〔﹣(﹣)〕÷.
脱式计算(能简算的要简算)12.03﹣22.78÷3.4 4.78×99+4.78 2.5×6.9×428.8÷1.2×0.6 6.8+3.2÷2.5 8.6×3.3+2.7×8.6.
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=