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试题原文 |
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(1)10.1×85, =(10+0.1)×85, =850+8.5, =858.5; (2)125×9.3×0.08, =125×0.08×9.3, =10×9.3, =93; (3)43.72×7.9+2.1×43.27, =43.72×(7.9+2.1), =43.72×10, =437.2; (4)93÷0.25÷4, =93÷(0.25×4), =93÷1, =93; (5)2.3+3.91÷(22-19.7), =2.3+3.91÷2.3, =2.3+1.7, =4; (6)7.92×6-18.45÷3, =47.52-6.15, =41.37; (7)6.78+6.78×99, =6.78×(1+99), =6.78×100, =678; (8)18-(1.4+1.25×2.4), =18-(1.4+1.25×8×0.3), =18-(1.4+3), =18-4.4, =13.6; (9)0.8×[13-(3.12+5.28)], =0.8×[13-8.4], =0.8×4.6, =3.68. |
经过对同学们试题原文答题和答案批改分析后,可以看出该题目“灵活计算,能用简便方法的要简算.10.1×85125×9.3×0.0843.72×..”的主要目的是检查您对于考点“小学运算定律和简便算法”相关知识的理解。有关该知识点的概要说明可查看:“小学运算定律和简便算法”。