题目内容

计算:
(1)2011-2.6×2.6+
7
5
×1.4

(2)
3
7
×2.96÷2
1
11
÷(1
5
7
×1.48)×4
2
11


(3)2
2
3
×(1
7
8
-
5
6
)-(
7
8
+1
5
6
)÷3
1
4

(4)[
1
24
+
3
14
×2+(1
7
12
-0.625)]×0.7
分析:本题根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:(1)2011-2.6×2.6+
7
5
×1.4

=2011-6.76+3.36,
=2004.24+3.36,
=2007.6;

(2)
3
7
×2.96÷2
1
11
÷(1
5
7
×1.48)×4
2
11

=
3
7
×
74
25
×
11
23
÷(
12
7
×
49
25
)×
46
11

=
3
7
×
74
25
×
11
23
×
25
84
×
46
11

=
37
49


(3)2
2
3
×(1
7
8
-
5
6
)-(
7
8
+1
5
6
)÷3
1
4

=
8
3
×
25
24
-
65
24
×
4
13

=
25
9
-
5
6

=
5
3


(4)[
1
24
+
3
14
×2+(1
7
12
-0.625)]×0.7

=[
1
24
+
3
7
+(
19
12
-
5
8
)]×0.7,
=[
1
24
+
3
7
+
23
24
]×0.7,
=[1+
3
7
]×0.7,
=
10
7
×
7
10

=1.
点评:本题中的题目由于不能运用简便方法计算,因此完成时要细心,注意通分约分.
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