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口算.
3
11
=
1
8
×
4
9
=
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
11
=11
1
8
×
4
9
=
1
18
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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