直接寫(xiě)出得數(shù):
1
3
-
1
4
=
9
14
×
7
12
=
5
8
÷
5
12
=
15÷
5
8
=
4
5
噸:450千克=
1
4
÷
1
2
=
0.1÷
1
100
=
1
7
×2.1=
3
4
X+
1
2
X=
0.125×0.25=
分析:
4
5
噸:450千克,先把比的前項(xiàng)化成800千克,再運(yùn)用比的性質(zhì)把比化成最簡(jiǎn)比;
3
4
X+
1
2
X,運(yùn)用乘法分配律計(jì)算;
把0.125×0.25改寫(xiě)成
1
8
×
1
4
計(jì)算;
其它算式按照分?jǐn)?shù)四則運(yùn)算的方法計(jì)算.
解答:

解:
1
3
-
1
4
=
1
12
9
14
×
7
12
=
3
8
5
8
÷
5
12
=
3
2
15÷
5
8
=24
4
5
噸:450千克=
16
9
1
4
÷
1
2
=
1
2
0.1÷
1
100
=10
1
7
×2.1=0.3
3
4
X+
1
2
X=
5
4
X
0.125×0.25=
1
32
點(diǎn)評(píng):本題考查分?jǐn)?shù)、小數(shù)四則運(yùn)算的方法,計(jì)算時(shí)要細(xì)心,注意把結(jié)果化成最簡(jiǎn)分?jǐn)?shù).
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