直接寫出得數(shù).
4
11
+
7
11
=
2
5
+
1
4
=
7-
1
4
=
1
2
+
5
6
=
分析:本題根據(jù)分?jǐn)?shù)加減法的運(yùn)算法則計(jì)算即可:同分母相加減,分子相加減,分母不變;異分母相加減,先將異分母分?jǐn)?shù)進(jìn)行通分,化為同分母分?jǐn)?shù)后,再按同分母分?jǐn)?shù)的計(jì)算法則進(jìn)行計(jì)算.
解答:
解:
4
11
+
7
11
=1,
2
5
+
1
4
=
13
20
,
7-
1
4
=6
3
4
1
2
+
5
6
=
4
3
點(diǎn)評:完成本題要細(xì)心,注意通分,結(jié)果化為最簡分?jǐn)?shù).
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