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7-0.8+8.3-0.2数学公式数学公式
数学公式1.25×16×2.5数学公式

解:(1)7-0.8+8.3-0.2,
=(7+8.3)-(0.2+0.8),
=15.3-1,
=14.3;

(2)
=
=
=1


(3)(18-)÷
=3×
=3


(4)
=×(),
=1,
=

(5)1.25×16×2.5,
=(1.25×8)×(2.5×2),
=10×5,
=50;

(6)÷[()×],
=÷[×],
=
=
=
分析:(1)我们运用加法的结合律及交换律进行解答即可.
(2)、(3)、(6)四则混合运算的顺序进行计算即可.
(4)运用乘法的分配律进行计算即可.
(5)运用乘法的结合律及交换律,进行解答即可.
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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