题目内容
简便计算.
9.6+1.8-1.6 | 0.21+3.48+0.89+2.52 | 15.3-(0.91+2.3) |
分析:(1)(2)运用加法交换律与结合律简算;
(3)运用减法的性质以及加法交换律与结合律简算.
(3)运用减法的性质以及加法交换律与结合律简算.
解答:解:(1)9.6+1.8-1.6,
=(9.6-1.6)+1.8,
=8+1.8,
=9.8;
(2)0.21+3.48+0.89+2.52,
=(0.21+0.89)+(3.48+2.52),
=1.1+6,
=7.1;
(3)15.3-(0.91+2.3),
=15.3-0.91-2.3,
=(15.3-2.3)-0.91,
=13-0.91,
=12.09.
=(9.6-1.6)+1.8,
=8+1.8,
=9.8;
(2)0.21+3.48+0.89+2.52,
=(0.21+0.89)+(3.48+2.52),
=1.1+6,
=7.1;
(3)15.3-(0.91+2.3),
=15.3-0.91-2.3,
=(15.3-2.3)-0.91,
=13-0.91,
=12.09.
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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