题目内容
计算下面各题,能简便的用简便方法计算. 2.39×0.5×2 | 0.91÷0.7+0.168÷0.8 |
16.7×1.53-1.53×6.7 | 9÷[0.2×(3-0.75)] |
考点:小数四则混合运算
专题:运算顺序及法则
分析:(1)运用乘法结合律进行计算;
(2)先同时算除法,最后算加法;
(3)运用乘法分配律进行简算;
(4)先算小括号里的,再算中括号里的,最后算除法.
(2)先同时算除法,最后算加法;
(3)运用乘法分配律进行简算;
(4)先算小括号里的,再算中括号里的,最后算除法.
解答:
解:(1)2.39×0.5×2
=2.39×(0.5×2 )
=2.39×1
=2.39
(2)0.91÷0.7+0.168÷0.8
=1.3+0.21
=1.51
(3)16.7×1.53-1.53×6.7
=1.53×(16.7-6.7)
=1.53×10
=15.3
(4)9÷[0.2×(3-0.75)]
=9÷[0.2×2.25]
=9÷0.45
=20
=2.39×(0.5×2 )
=2.39×1
=2.39
(2)0.91÷0.7+0.168÷0.8
=1.3+0.21
=1.51
(3)16.7×1.53-1.53×6.7
=1.53×(16.7-6.7)
=1.53×10
=15.3
(4)9÷[0.2×(3-0.75)]
=9÷[0.2×2.25]
=9÷0.45
=20
点评:此题考查了学生脱式计算的能力,以及对运算定律的灵活运用能力.
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