题目内容
脱式计算,能简算的要简算.
17.59-9.74+5.73 | 19.92+11.55-9.92 | 67.44-(15.72-23.89) |
40-(2.75+0.14) | 8.84+4.16-8.84+4.16 | 15.46-5.7+4.3. |
考点:小数四则混合运算
专题:运算顺序及法则
分析:(1)按照从左向右的顺序进行计算;
(2)根据加法交换律进行简算;
(3)根据减法的性质进行计算;
(4)先算加法,再算减法;
(5)根据加法交换律和结合律进行简算;
(6)按照从左向右的顺序进行计算.
(2)根据加法交换律进行简算;
(3)根据减法的性质进行计算;
(4)先算加法,再算减法;
(5)根据加法交换律和结合律进行简算;
(6)按照从左向右的顺序进行计算.
解答:
解:(1)17.59-9.74+5.73
=7.85+5.73
=13.58;
(2)19.92+11.55-9.92
=19.92-9.92+11.55
=10+11.55
=21.55;
(3)67.44-(15.72-23.89)
=67.44-15.72+23.89
=51.72+23.89
=75.61;
(4)40-(2.75+0.14)
=40-2.89
=37.11;
(5)8.84+4.16-8.84+4.16
=(8.84-8.84)+(4.16+4.16)
=0+8.32
=8.32;
(6)15.46-5.7+4.3
=9.76+4.3
=14.06.
=7.85+5.73
=13.58;
(2)19.92+11.55-9.92
=19.92-9.92+11.55
=10+11.55
=21.55;
(3)67.44-(15.72-23.89)
=67.44-15.72+23.89
=51.72+23.89
=75.61;
(4)40-(2.75+0.14)
=40-2.89
=37.11;
(5)8.84+4.16-8.84+4.16
=(8.84-8.84)+(4.16+4.16)
=0+8.32
=8.32;
(6)15.46-5.7+4.3
=9.76+4.3
=14.06.
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定律简便计算.
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