题目内容
【题目】计算下面各题,能用简便方法计算要用简便方法计算.
(1)13.92﹣(1.19+9.92)﹣2.81 | (2)(+﹣)×30 |
(3)55×66÷(11×11) | (4)40.2﹣4÷80×2.4 |
(5)×[÷(×)] | (6)×2002. |
【答案】0 13 30 40.08 2000
【解析】
试题分析:(1)根据减法的性质简算;
(2)运用乘法分配律简算;
(3)根据除法的性质简算;
(4)先算除法,再算除法,最后算减法;
(5)先算小括号里面的乘法,再算中括号里面的除法,最后算括号外的除法;
(6)先把2002分解成(2001+1),再运用乘法分配律简算.
解答:解:(1)13.92﹣(1.19+9.92)﹣2.81,
=13.92﹣1.19﹣9.92﹣2.81,
=(13.92﹣9.92)﹣(1.19+2.81),
=4﹣4,
=0;
(2)(+﹣)×30,
=×30+×30﹣×30,
=12+5﹣4,
=13;
(3)55×66÷(11×11),
=55×66÷11÷11,
=(55÷11)×(66÷11),
=5×6,
=30;
(4)40.2﹣4÷80×2.4,
=40.2﹣0.05×2.4,
=40.2﹣0.12,
=40.08;
(5)×[÷(×)],
=×[÷],
=×,
=;
(6)×2002,
=×(2001+1),
=×2001+×1,
=2000+,
=2000.
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