分析:(1)可將原式變?yōu)?.5×0.25+360×0.25+0.25×36.5后,根據(jù)乘法分配律計(jì)算.
(2)可將括號(hào)中的分?jǐn)?shù)變?yōu)榘俜謹(jǐn)?shù)后,根據(jù)乘法分配律計(jì)算括號(hào)中的算式.
(3)可將式中的分?jǐn)?shù)、百分?jǐn)?shù)變成小數(shù)后計(jì)算.
解答:解:(1)3
÷4+360×25%+0.25×36.5
=3.5×
+360×0.25+0.25×36.5
=3.5×0.25+360×0.25+0.25×36.5
=(3.5+36.5+360)×0.25
=400×0.25
=100;
(2)(7.25×40%+2.75×
)÷20%
=(7.25×40%+2.75×40%)÷20%
=(7.25+2.75)×40%÷20%
=10×40%÷20%
=4÷20%
=20;
(3)[1.9+19%×(4.8-3
)]÷(2
-190%)
=[1.9+0.19×(4.8-3.8)]÷(2.9-1.9)
=(1.9+0.19×1)÷1
=(1.9+0.19)÷1
=2.09÷1
=2.09.
點(diǎn)評(píng):當(dāng)算式中同時(shí)含有分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)時(shí),可根據(jù)式中數(shù)據(jù)的特點(diǎn),將它們化成統(tǒng)一數(shù)據(jù)形式后計(jì)算.