下面各题,怎样算简便就怎样算.(1)(2)(3)(4)(5)(6)(7)(8).

发布时间:2020-08-08 05:27:43

下面各题,怎样算简便就怎样算.
(1)(2)(3)(4)(5)(6)(7)(8).

网友回答

解:(1),
=+,
=1;

(2),
=10-,
=9;

(3),
=(7)×(9),
=1×1,
=1;

(4),
=36××,
=11×,
=8.;

(5),
=()×,
=1×,
=;

(6),
=×(399+1),
=400,
=180;

(7),
=×36+36-36,
=7+15-9,
=22-9,
=13;

(8),
=24×+1×,
=1,
=1.
解析分析:(1)(2)按照先算第二级运算,再算第一级运算的顺序解答,
(3)运用乘法交换律和结合律解答,
(4)运用乘法交换律解答,
(5)(6)(7)(8)运用乘法分配律解答.

点评:本题考查知识点:(1)依据四则运算顺序正确进行计算,(2)正确运用简便方法解决问题.
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