11
15
×
25
44
=
25
39
×
13
50
=
10
9
×6×0
=
180÷
9
10
=
7
11
÷14
=
0.8÷
16
13
=
1
3
=
1-
1
2
-
1
3
=
1
6
×12=
2
9
÷
3
5
=
(3
1
8
+
7
9
)×0=
1
2
+
7
12
=
分析:根據(jù)分?jǐn)?shù)乘法的計(jì)算法則,分子相乘的積作分子,分母相乘的積作分母,能約分的要先約分再相乘計(jì)算比較簡(jiǎn)便.分?jǐn)?shù)的除法把除數(shù)轉(zhuǎn)化為乘它的倒數(shù),再根據(jù)分?jǐn)?shù)乘法的計(jì)算方法計(jì)算,異分母分?jǐn)?shù)相加、減、先通分再按照同分母分?jǐn)?shù)的加、減法則進(jìn)行計(jì)算.
解答:解:
11
15
×
25
44
=
5
12
;
25
39
×
13
50
=
1
6
;
10
9
×6×0
=0;
180÷
9
10
=200;
7
11
÷14
=
1
22
;
0.8÷
16
13
=
13
20
;
1
3
=3;
1-
1
2
-
1
3
=
1
6
;
1
6
×12=2;
2
9
÷
3
5
=
10
27
;
(3
1
8
+
7
9
)×0=0;
1
2
+
7
12
=1
1
12
點(diǎn)評(píng):此題主要考查分?jǐn)?shù)四則運(yùn)算和四則混合運(yùn)算的計(jì)算,直接根據(jù)法則進(jìn)行口算.
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