1
2
-
1
4
=
3
5
×
1
3
=
0.25÷
1
4
=
3+
1
3
÷
1
3
=
1-15%= 10÷0.1= 1000-405= 40×20%=
分析:①通分計算;②約分計算;③把分?jǐn)?shù)化為小數(shù)或把小數(shù)化為分?jǐn)?shù),結(jié)果為1;④一個數(shù)除以本身結(jié)果為1,然后再加上3即可;⑤把百分?jǐn)?shù)化為小數(shù),再計算;⑥把被除數(shù)和除數(shù)分別擴(kuò)大1甌北,再相除;⑦把405看作400+5,運(yùn)用加法結(jié)合律簡算;⑧把20%化為小數(shù)計算.
解答:解:
1
2
-
1
4
=
1
4
;          
3
5
×
1
3
=
1
5
;           0.25÷
1
4
=1;           3+
1
3
÷
1
3
=4;
1-15%=0.85;            10÷0.1=100;         1000-405=595;        40×20%=8.
點(diǎn)評:此題考查了數(shù)的轉(zhuǎn)化、約分、通分、運(yùn)算定律等知識,根據(jù)題目特點(diǎn),靈活解答.
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