递等式计算．（能用简便算法的用简便方法计算）
1.5×105 2.33×0.5×4 24.6+18.7+15.4
1.2×2.5+0.8×2.5 2.05÷0.82+33.6 9.07﹣22.78÷3.4．
递等式计算．（能用简便算法的用简便方法计算）
1.5×105 2.33×0.5×4 24.6+18.7+15.4
1.2×2.5+0.8×2.5 2.05÷0.82+33.6 9.07﹣22.78÷3.4．
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