题目内容
脱式计算
(52-39)×26 | 728-(660+145÷29) | (75+360)÷(20-5) | 300-225÷5+145. |
分析:(1)先算减法,再算乘法;
(2)先算除法,再算加法,最后算减法;
(3)先算加法和减法,再算除法;
(4)先算除法,再算减法,最后算加法.
(2)先算除法,再算加法,最后算减法;
(3)先算加法和减法,再算除法;
(4)先算除法,再算减法,最后算加法.
解答:解:
(1)(52-39)×26,
=13×26,
=338;
(2)728-(660+145÷29),
=728-(660+5),
=728-665,
=63;
(3)(75+360)÷(20-5),
=435÷15,
=29;
(4)300-225÷5+145,
=300-45+145,
=300+100,
=400.
(1)(52-39)×26,
=13×26,
=338;
(2)728-(660+145÷29),
=728-(660+5),
=728-665,
=63;
(3)(75+360)÷(20-5),
=435÷15,
=29;
(4)300-225÷5+145,
=300-45+145,
=300+100,
=400.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可.
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