题目内容
直接写出得数:
(1)[0.85-(-0.15)]÷
(2)[(7+2.4÷6)+2]×5
(3)×(17×-)-(12-3-2)
(1)[0.85-(-0.15)]÷,
=[0.85+0.15-]×,
=
=,
=;
(2)[(7+2.4÷6)+2]×5,
=[2.4×]×5,
=[]×5,
=[+]×5,
=×5,
=,
=51;
(3)×(17×-)-(12-3-2),
=(×17×-×)-(12),
=--12+3,
=4+3+2-12,
=10-12-,
=10-(12),
=9-12,
=-3.
分析:运用分数,小数的四则混合运算的顺序及分数,小数的加减乘除法的计算法则进行计算即可.
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.
=[0.85+0.15-]×,
=
=,
=;
(2)[(7+2.4÷6)+2]×5,
=[2.4×]×5,
=[]×5,
=[+]×5,
=×5,
=,
=51;
(3)×(17×-)-(12-3-2),
=(×17×-×)-(12),
=--12+3,
=4+3+2-12,
=10-12-,
=10-(12),
=9-12,
=-3.
分析:运用分数,小数的四则混合运算的顺序及分数,小数的加减乘除法的计算法则进行计算即可.
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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