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.
(1)1.5×105 =1.5×(100+5) =1.5×100+1.5×5 =157.5; (2)2.33×0.5×4 =2.33×(0.5×4) =2.33×2 =4.66; (3)24.6+18.7+15.4 =24.6+15.4+18.7 =40+18.7 =58.7; (4)1.2×2.5+0.8×2.5 =2.5×(1.2+0.8) =2.5×2 =5; (5)2.05÷0.82+33.6 =2.5+33.6 =36.1; (6)9.07-22.78÷3.4 =9.07-6.7 =2.37; 故答案为157.5;4.66;58.7;5;36.1;2.37. |
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