题目内容
计算
0.4×99+0.4= | 0.65×6.4-0.65×5.4= | 2.4×3÷0.18= |
4.28+0.53-3.37= | 12.8+2.04×9.5= | 0.36÷[(6.1-4.6)×0.8]. |
考点:小数四则混合运算
专题:运算顺序及法则
分析:(1)(2)运用乘法分配律简算.
(3)(4)从左往右依次运算.
(5)先算乘法,再算加法.
(6)先算小括号内的,再算中括号内的,最后算括号外的.
(3)(4)从左往右依次运算.
(5)先算乘法,再算加法.
(6)先算小括号内的,再算中括号内的,最后算括号外的.
解答:
解:(1)0.4×99+0.4
=0.4×(99+1)
=0.4×100
=40
(2)0.65×6.4-0.65×5.4
=0.65×(6.4-5.4)
=0.65×1
=0.65
(3)2.4×3÷0.18
=7.2÷0.18
=40
(4)4.28+0.53-3.37
=4.81-3.37
=1.44
(5)12.8+2.04×9.5
=12.8+19.36
=32.18
(6)0.36÷[(6.1-4.6)×0.8]
=0.36÷[1.5×0.8]
=0.36÷1.2
=0.3
=0.4×(99+1)
=0.4×100
=40
(2)0.65×6.4-0.65×5.4
=0.65×(6.4-5.4)
=0.65×1
=0.65
(3)2.4×3÷0.18
=7.2÷0.18
=40
(4)4.28+0.53-3.37
=4.81-3.37
=1.44
(5)12.8+2.04×9.5
=12.8+19.36
=32.18
(6)0.36÷[(6.1-4.6)×0.8]
=0.36÷[1.5×0.8]
=0.36÷1.2
=0.3
点评:此题考查了小数的四则混合运算,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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