题目内容
用你喜欢的方法计算下面各题.
13.75-5.28-4.72 | 2.25+4.8+0.75 |
8-7.19+3.83 | 9.65-(7.03+1.65) |
8.4-7.85+3.2 | 2.58-(3.5-2.42) |
考点:小数的加法和减法
专题:运算顺序及法则
分析:①13.75-5.28-4.72,根据减法的运算性质进行简算.
②2.25+4.8+0.75,运用加法结合律和结合律简算;
③8-7.19+3.83,先算减法,再算加法;
④9.65-(7.03+1.65),根据减法的运算性质简算;
⑤8.4-7.85+3.2,先算减法,再算加法;
⑥2.58-(3.5-2.42),根据减法的运算性质进行简算.
②2.25+4.8+0.75,运用加法结合律和结合律简算;
③8-7.19+3.83,先算减法,再算加法;
④9.65-(7.03+1.65),根据减法的运算性质简算;
⑤8.4-7.85+3.2,先算减法,再算加法;
⑥2.58-(3.5-2.42),根据减法的运算性质进行简算.
解答:
解:①13.75-5.28-4.72
=13.75-(5.28+4.72)
=13.75-10
=3.75;
②2.25+4.8+0.75
=4.8+(2.25+0.75)
=4.8+3
=7.8;
③8-7.19+3.83
=0.81+3.83
=4.64;
④9.65-(7.03+1.65)
=9.65-1.65-7.03
=8-7.03
=0.97;
⑤8.4-7.85+3.2
=0.55+3.2
=3.75;
⑥2.58-(3.5-2.42)
=2.58+2.42-3.5
=5-3.5
=1.5.
=13.75-(5.28+4.72)
=13.75-10
=3.75;
②2.25+4.8+0.75
=4.8+(2.25+0.75)
=4.8+3
=7.8;
③8-7.19+3.83
=0.81+3.83
=4.64;
④9.65-(7.03+1.65)
=9.65-1.65-7.03
=8-7.03
=0.97;
⑤8.4-7.85+3.2
=0.55+3.2
=3.75;
⑥2.58-(3.5-2.42)
=2.58+2.42-3.5
=5-3.5
=1.5.
点评:此题考查的目的是理解掌握小数四则混合运算的顺序以及它们的计算法则,并且能够灵活运用加法的运算定律,以及加、减法的运算性质进行简便计算.
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