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
根據(jù)乘法交換律和乘法結(jié)合律簡(jiǎn)算;
36×(
1
4
+
1
9
)
運(yùn)用乘法分配律簡(jiǎn)算;
其它題目根據(jù)運(yùn)算法則直接求解.
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.
點(diǎn)評(píng):本題考查了簡(jiǎn)單的運(yùn)算,要注意根據(jù)運(yùn)算法則和運(yùn)算定律快速準(zhǔn)確的得出答案.
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