3 运动定律与简便运算
能用简算的用简便算法计算,写出简算过程.
5.4×2.08﹣5.4×1.08 7.68×0.25×4 8.2×2.5+17.5 (12.4+16.8)÷0.4.
计算下面各题,能简算的要写出简算过程.
①6.72+2.08×4×1.5
②12.56÷2.5÷0.4
③2.85×4.7+28.5×0.53
④9.88÷[5×(7.34﹣6.96)]
⑤2.5×3.2×1.25
⑥0.56×99.
用递等式计算,能简便计算的用简便方法计算
(1)37.7÷13+1.8×2.4
(2)1.25×3.2×0.25
(3)1.06×(2.9+1.6)÷0.01
(4)6.27×5.2+5.8×6.27﹣6.27
(5)50.5÷[(15.6﹣3.5×4)÷3.2].
(1)79.76+84.7×0.2 (2)15.37+28.44+12.56
(3)(2.3×8.8﹣2.3×0.8)×1.25 (4)[5.2﹣(2.5+7.5÷5)]×1.2.
下面各题怎样算简便就怎样算.
18.65﹣3.7+1.35﹣6.3 30×[3.61÷(7.2﹣5.3)]
36÷[1.44×(0.1﹣0.05)] (16.5×3+3×7.5)÷6.