5.2×
+25%+1.8×0.25 101×6.7
(
-
)÷
.解:(1)5.2×
+25%+1.8×0.25,=5.2×0.25+0.25+1.8×0.25,
=(5.2+1+1.8)×0.25,
=8×0.25,
=2;
(2)101×6.7,
=(100+1)×6.7,
=100×6.7+6.7,
=670+6.7,
=676.7;
(3)(

)
,=
12
12,=4-3,
=1.
分析:(1)5.2×
+25%+1.8×0.25,首先把
和25%化成小数是0.25,再运用乘法分配律进行简算;(2)101×6.7,转化为:(100+1)×6.7,运用乘法分配律进行简算;
(3)(

)
,把除数转化为乘它的倒数,再运用乘法分配律进行简算.点评:此题考查的目的是使学生灵活运用运算定律对分数、小数四则混合运算进行简便计算.