题目内容

口算．
3÷
3
11
=
1
8
×
4
9
=		 0÷
98
99
=		 4×15÷4×
2
15
=
4
15
÷4=		 21×
5
7
=
8
9
×
3
4
=		 36×(
1
4
+
1
9
)=
分析：4×15÷4×
2
15
根据乘法交换律和乘法结合律简算；
36×(
1
4
+
1
9
)运用乘法分配律简算；
其它题目根据运算法则直接求解．
解答：解：
3÷
3
11
=11
1
8
×
4
9
=
1
18
 0÷
98
99
=0		 4×15÷4×
2
15
=2
4
15
÷4=
1
15
 21×
5
7
=15
8
9
×
3
4
=
2
3
 36×(
1
4
+
1
9
)=13．
点评：本题考查了简单的运算，要注意根据运算法则和运算定律快速准确的得出答案．
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口算．

5+2.5=
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÷4=
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=
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×30=		 72÷
36
5
=
口算
1
4
×
1
3
=
4
7
÷2=
1
2
÷
1
2
=		 10÷
5
6
=
2
3
×
3
4
=
9
10
÷
1
5
=
1
6
÷6=
8
9
÷4=		 15×
4
5
=		 15÷
1
3
=
3
4
×
2
9
=
2
3
÷
1
2
=
2
5
×
1
2
=
1
2
÷
1
4
=
1
2
×
1
4
=
4
5
÷
1
5
=
3
7
×14=
1
4
÷
1
2
=
1
2
-
1
4
=
4
9
×
3
4
=
5
8
×
2
5
=
1
6
÷
2
3
=
1
2
+
1
4
=
3
5
÷1=
7
15
×5=		 1÷
3
4
=
1
2
÷
1
4
=		 1÷
3
5
=
3
4
×12=
1
5
÷
2
3
=
7
9
×
3
7
=		 1-
3
5
=		 18×
5
6
=		 7÷
7
5
=
1
3
+
1
6
=		 1+
3
5
=
2
9
×
1
4
=
8
3
÷2=
3
5
÷
2
5
=
5
9
÷3=
5
6
×
3
10
=
2
5
÷
1
2
=
8×
1
4
=		 9÷
3
4
=		 30×
1
3
=
4
5
÷2=
5
24
÷
5
6
=
5
8
×
1
2
×0=
1
3
×
3
11
=		 8÷
1
4
=
9
10
÷
3
5
=		 0÷
1
3
÷
1
2
=		 1×
9
11
=
2
5
÷
1
5
=
1
3
÷
1
3
=		 0×
2
9
÷
1
2
=
5
6
×
6
5
=
1
5
÷
1
3
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5
12
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2
÷
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2
=

口算
260+400=640-400=900×9=400÷5=34×2=
4800÷8=250-70=140×3=64-0=940+60=
4×500=120×4=数学公式=数学公式=数学公式=
605+200=24÷5=1-数学公式=60×9=400×7=
210×3=45÷9=39÷7=125×8=133×2=
89×5≈181×2≈12×7≈512×4≈311×3≈
960-160=280+80=32×3=数学公式=数学公式=
15+5×2=15×4-25=10+10×0=20-12÷3=72÷8-8=

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