考點(diǎn):小數(shù)的加法和減法,分?jǐn)?shù)乘法,分?jǐn)?shù)除法,分?jǐn)?shù)的四則混合運(yùn)算,百分?jǐn)?shù)的加減乘除運(yùn)算
專題:運(yùn)算順序及法則
分析:8.1-6
中,先將分?jǐn)?shù)化成小數(shù)然后計(jì)算;
×2.4,將小數(shù)化成分?jǐn)?shù)然后解答;
0.375×
,將小數(shù)化成分?jǐn)?shù)解答;
5
+0.3,將分?jǐn)?shù)化成小數(shù),然后解答;
50%+
,將百分?jǐn)?shù)化成分?jǐn)?shù)解答;
1
÷1.75,將分?jǐn)?shù)化成小數(shù)解答;
×5.6,將小數(shù)化成分?jǐn)?shù)解答;
-
,都化成小數(shù),然后解答;
3
-3
×
中,首先計(jì)算乘法,然后再計(jì)算減法;
×
÷
×
中,按照分?jǐn)?shù)四則混合運(yùn)算的順序,從左到右解答.
解答:
解:
8.1-6=1.6 |
×2.4=2 |
0.375×= |
5+0.3=5.7 |
3-3×=3 |
50%+=1 |
1÷1.75=1 |
×5.6=3.2 |
-=0.1 |
×÷×=. |
點(diǎn)評(píng):此題考查了計(jì)算,需要注意的是要清楚加減法計(jì)算時(shí),小數(shù)計(jì)算上相對(duì)比較簡(jiǎn)單,對(duì)于乘除法的計(jì)算而言分?jǐn)?shù)的計(jì)算相對(duì)比較簡(jiǎn)單,不過也得根據(jù)習(xí)題中的具體數(shù)據(jù)來進(jìn)行分析,另外兩步以上的計(jì)算時(shí)還需注意運(yùn)算順序.