题目内容
计算下面各题,能简便的要简便计算. 3.72+5.3+7.28+3.7 |
7000÷125÷8 | 1600-600÷75+25 |
35×125×16 | 78×63-78+38×78 | (480+120÷15)×50. |
分析:(1)运用加法交换律和加法结合律解答;
(2)运用除法的性质解答;
(3)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答;
(4)化16=8×2,再运用乘法交换律,以及乘法结合律解答;
(5)(6)运用乘法分配律解答.
(2)运用除法的性质解答;
(3)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答;
(4)化16=8×2,再运用乘法交换律,以及乘法结合律解答;
(5)(6)运用乘法分配律解答.
解答:解:(1)3.72+5.3+7.28+3.7,
=(3.72+7.28)+(5.3+3.7),
=11+9,
=20;
(2)7000÷125÷8,
=7000÷(125×8),
=7000÷1000,
=7;
(3)1600-600÷75+25,
=1600-8+25,
=1592+25,
=1617;
(4)35×125×16,
=(35×2)×(125×8),
=70×1000,
=70000;
(5)78×63-78+38×78,
=78×(63-1+38),
=78×100,
=7800;
(6)(480+120÷15)×50,
=(480+8)×50,
=480×50+8×50,
=24000+400,
=24400.
=(3.72+7.28)+(5.3+3.7),
=11+9,
=20;
(2)7000÷125÷8,
=7000÷(125×8),
=7000÷1000,
=7;
(3)1600-600÷75+25,
=1600-8+25,
=1592+25,
=1617;
(4)35×125×16,
=(35×2)×(125×8),
=70×1000,
=70000;
(5)78×63-78+38×78,
=78×(63-1+38),
=78×100,
=7800;
(6)(480+120÷15)×50,
=(480+8)×50,
=480×50+8×50,
=24000+400,
=24400.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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