题目内容
计算下面各题,能简算的请用简便方法计算. 5.6-4.28+6.O9 |
32-6.34-3.66 | 2.5+3.25+0.75+7.5. |
分析:(1)先算减法,再算加法;
(2)根据连减的性质进行计算;
(3)根据加法交换律和结合律进行计算.
(2)根据连减的性质进行计算;
(3)根据加法交换律和结合律进行计算.
解答:解:
(1)5.6-4.28+6.O9,
=1.32+6.09,
=7.41;
(2)32-6.34-3.66,
=32-(6.34+3.66),
=32-10,
=22;
(3)2.5+3.25+0.75+7.5,
=(2.5+7.5)+(3.25+0.75),
=10+4,
=14.
(1)5.6-4.28+6.O9,
=1.32+6.09,
=7.41;
(2)32-6.34-3.66,
=32-(6.34+3.66),
=32-10,
=22;
(3)2.5+3.25+0.75+7.5,
=(2.5+7.5)+(3.25+0.75),
=10+4,
=14.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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