题目内容
递等式计算
876-238+162 | 832÷8+497 | 5120-680×5 |
900-452-348 | 836÷4×5 | 45×6+6×55. |
解:876-238+162, =638+162, =800; | 832÷8+497, =104+497, =601; | 5120-680×5, =5120-3400, =1720; |
900-452-348, =900-(452+348), =900-800, =100; | 836÷4×5, =209×5, =1045, | 45×6+6×55, =(45+55)×6, =100×6, =600. |
分析:横向数:(1)(2)(3)(5)按照四则运算计算顺序,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算解答,
(4)运用减法性质解答,
(6)运用乘法分配律解答.
点评:本题考查知识点:(1)四则运算计算顺序,(2)简便算法正确运用.
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