计算①920÷[12×(25+45)]②(0.4+23)÷(56-0.75)×0.5③1.25+114×7.4+125%÷58④393939×899899377377×939393⑤6.6-135÷(0.375×45+18×0.8)⑥514-2.125+(4.75-338)⑦1124+[(1.5-数学 打印页面 - 零零教育信息网
计算①920÷[12×(25+45)]②(0.4+23)÷(56-0.75)×0.5③1.25+114×7.4+125%÷58④393939×899899377377×939393⑤6.6-135÷(0.375×45+18×0.8)⑥514-2.125+(4.75-338)⑦1124+[(1.5-数学 |
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[db:作者] 2019-03-19 00:00:00 零零社区 |
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题文
计算 ①÷[×(+)] ②(0.4+)÷(-0.75)×0.5 ③1.25+1×7.4+125%÷ ④393939×899899 | 377377×939393 |
⑤6.6-1÷(0.375×+×0.8) ⑥5-2.125+(4.75-3) ⑦1+[(1.5+2)÷3.75-]÷ ⑧+++…+. |
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题型:解答题 难度:中档
答案
①÷[×(+)], =÷[×], =÷, =;
②(0.4+)÷(-0.75)×0.5, =÷×0.5, =×0.5, =6.4;
③1.25+1×7.4+125%÷, =1.25+1.25×7.4+1.25×1.6, =1.25×(1+7.4+1.6), =1.25×10, =12.5;
④393939×899899 | 377377×939393 | , =(3×13×10101)×(29×31×1001) | (13×29×1001)×(3×31×10101) | , =3×13××29×31×1001×10101 | 3×13×29×31×1001×10101 | , =1;
⑤6.6-1÷(0.375×+×0.8), =6.6-1÷(0.375×0.8+×0.8), =6.6-1÷[(0.375+)×0.8], =6.6-1÷[0.5×0.8], =6.6-1÷0.4, =6.6-4, =2.6;
⑥5-2.125+(4.75-3), =5.25-2.125+4.75-3.375, =(5.25+4.75)-(2.125+3.375), =10-5.5, =4.5;
⑦1+[(1.5+2)÷3.75-]÷, =1+[÷3.75-]÷, =1+[-]÷, =1+÷, =1+, =1;
⑧+++…+, =×(1-+-+-+…+-), =×(1-), =×, =. |
据专家权威分析,试题“计算①920÷[12×(25+45)]②(0.4+23)÷(56-0.75)×0.5③1.25+114×7...”主要考查你对 运算定律和简便算法,分数的简便算法 等考点的理解。关于这些考点的“档案”如下:
运算定律和简便算法分数的简便算法
考点名称:运算定律和简便算法
考点名称:分数的简便算法
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