题目内容
用简便方法计算. 15.3+0.86+0.14+4.7 |
147×8+8×53 |
6900÷25÷4 | 25.3-8.1-10.9. |
分析:(1)运用加法交换律和加法结合律简算;
(2)运用乘法分配律简算;
(3)根据除法的性质简算;
(4)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)根据减法的性质简算.
解答:解:(1)15.3+0.86+0.14+4.7,
=(15.3+4.7)+(0.86+0.14),
=20+1,
=21;
(2)147×8+8×53,
=(147+53)×8,
=200×8,
=1600;
(3)6900÷25÷4,
=6900÷(25×4),
=6900÷100,
=69;
(4)25.3-8.1-10.9,
=25.3-(8.1+10.9),
=25.3-19,
=6.3.
=(15.3+4.7)+(0.86+0.14),
=20+1,
=21;
(2)147×8+8×53,
=(147+53)×8,
=200×8,
=1600;
(3)6900÷25÷4,
=6900÷(25×4),
=6900÷100,
=69;
(4)25.3-8.1-10.9,
=25.3-(8.1+10.9),
=25.3-19,
=6.3.
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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