题目内容
用递等式计算.
78×25-896 | 100×(804-775) | 453+805÷5 | (277+75)×25. |
分析:(1)先算乘法,再算减法;
(2)先算减法,再算乘法;
(3)先算除法,再算加法;
(4)先算加法,再算乘法.
(2)先算减法,再算乘法;
(3)先算除法,再算加法;
(4)先算加法,再算乘法.
解答:解:
(1)78×25-896,
=1950-896,
=1054;
(2)100×(804-775),
=100×29,
=2900;
(3)453+805÷5,
=453+161,
=614;
(4)(277+75)×25,
=352×25,
=8800.
(1)78×25-896,
=1950-896,
=1054;
(2)100×(804-775),
=100×29,
=2900;
(3)453+805÷5,
=453+161,
=614;
(4)(277+75)×25,
=352×25,
=8800.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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