看分数涂颜色.
递等式计算,写出必要的计算过程,能简便计算的用简便方法计算:(1)0.3×(1×0.5÷1×0.5)(2)1.25×6.4×2.5×5(3)4.8×2.5+17.22÷2.1(4)25.2×(0.32÷0.4)+8.6(5)3.25×4.8+7.75×4.8﹣4.8(6)6.4÷[(22.6﹣8.4×1.5)÷2.5].
计算,能简算的要简算10÷0.2÷2.5 64×4.5+3.6×45 1.25×3.2×0.814.5×102 14.64+3.7×2.8 8.4÷0.21÷0.5.
7.05×23.7+7.05×76.3.
用简便方法计算:1.29+3.7+0.71+6.3 528×78+472×78 125×89×8 57×101.
①12.5×3.7×0.8 ②4.6×2.3+7.7×4.6③3.6+(5.7+3.8)÷0.5 ④3.6÷0.4﹣1.5×3⑤0.1÷0.2÷0.4 ⑥80.3﹣5.6×1.7.