考點(diǎn):整數(shù)、分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:(1)(3)首先計(jì)算二級(jí)運(yùn)算,然后再計(jì)算一級(jí)運(yùn)算即可;
(2)(6)根據(jù)乘法分配律簡算即可;
(4)首先計(jì)算小括號(hào)里面的乘法、減法,然后計(jì)算小括號(hào)外面的即可;
(5)首先計(jì)算小括號(hào)里面的,然后再計(jì)算中括號(hào)里面的,最后計(jì)算中括號(hào)外面的即可.
解答:
解:(1)13.6×3-40
÷2
=40.8-20.3
=20.5
(2)99×0.75+
×99
=99×(0.75+0.25)
=99×1
=99
(3)2
-1
+1
÷1
=2
-1
+
=2
+-1=3-1
=
1(4)(9.3×
-7.3)÷2
=(7.75-7.3)÷2
=0.45÷2.25
=0.2
(5)[2+(2
-1.5)÷1
]×17%
=[2+
÷1
]×17%
=2
×
=
(6)0.4×1
+20%÷0.75
=0.4×1
+0.2×
=
×(0.4+0.2)=0.8
點(diǎn)評(píng):此題主要考查了整數(shù)、分?jǐn)?shù)、百分?jǐn)?shù)的四則混合運(yùn)算,注意運(yùn)算順序,注意加法、乘法運(yùn)算定律的應(yīng)用.