题目内容
下面各题,怎样算简便就怎样算. (1) | (2) |
(3) | (4) |
(5) | (6) |
(7) | (8). |
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.
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.
=+,
=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.
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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