题目内容

灵活选择算法脱式计算
(1)
1
5
÷(3-
7
13
-
6
13
)

(2)2011×
2009
2010

(3)125×(8+0.8+0.08)
(4)
7
9
÷
11
5
+
5
9
×
2
11
(1)
1
5
÷(3-
7
13
-
6
13
)

=
1
5
÷[3-(
7
13
+
6
13
)],
=
1
5
÷[3-1],
=
1
5
÷2,
=
1
10


(2)2011×
2009
2010

=(2010+1)×
2009
2010

=2010×
2009
2010
+1×
2009
2010

=2009+
2009
2010

=2009
2009
2010


(3)125×(8+0.8+0.08)
=125×8+125×0.8+125×0.08,
=1000+100+10,
=1110;

(4)
7
9
÷
11
5
+
5
9
×
2
11

=
7
9
×
5
11
+
5
9
×
2
11

=
5
9
×
7
11
+
5
9
×
2
11

=
5
9
×(
7
11
+
2
11
),
=
5
9
×
9
11

=
5
11
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