口算.
4
5
=
11-
4
9
=
1
3
+
1
4
=
1
2
÷3
=
0.125×8=
1
2
×
4
5
=
0.37+1.3=
1
2
÷
1
8
=
4-
7
8
-
1
8
=
2008×99+2008=
分析:4-
7
8
-
1
8
根據(jù)連續(xù)減去兩個(gè)數(shù)等于減去這兩個(gè)數(shù)的和簡算;2008×99+2008運(yùn)用乘法分配律簡算;其它題目根據(jù)運(yùn)算法則直接求解.
解答:解:
4
5
=
5
4
,
11-
4
9
=10
5
9
,
1
3
+
1
4
=
7
12
,
1
2
÷3
=
1
6
,
0.125×8=1,
1
2
×
4
5
=
2
5
0.37+1.3=1.67,
1
2
÷
1
8
=4,
4-
7
8
-
1
8
=3,
2008×99+2008=200800.
點(diǎn)評:本題考查了基本的運(yùn)算,注意運(yùn)算法則,靈活運(yùn)用運(yùn)算定律求解.
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