+2.7×25%
×11.6+18.4×
×
-60%×
×31+
×
+
÷
×38.解:(1)3×
+2.7×25% =3×
+2.7×
=(3+2.7)×
=5.7×

=
×
=
;(2)
×11.6+18.4×
=
×(11.6+18.4)=
×30=54;
(3)
×
-60%×
=(
-60%)×
=(
-
)×
=
×
=
;(4)
×31+
=
×(31+1)=
×32=7;
(5)
×
+
÷
=
×
+
×
=(
+
)×
=1×

=
;(6)
×38=
×(37+1)=
×37+
=33+

=33
.分析:(1)把百分数化为分数,运用乘法分配律简算;
(2)(3)(4)运用乘法分配律简算;
(5)把除法改为乘法,运用乘法分配律简算;
(6)把38看做37+1,运用乘法分配律简算.
点评:此题主要考查了乘法分配律的灵活运用.