题目内容

用自已喜欢的方法计算.
①2450-450÷18×25
7
11
+
1
5
+
4
11
+
3
5
③3618÷45-0.2  
④4-
4
5
÷4-
4
5
13
5
×8×
8
13
×1.25    
⑥2.9÷8+1.1×
1
8
①2450-450÷18×25
=2450-25×25,
=2450-625,
=1825;

7
11
+
1
5
+
4
11
+
3
5

=(
7
11
+
4
11
)+(
1
5
+
3
5
),
=1+
4
5

=1
4
5


③3618÷45-0.2
=80.4-0.2,
=80.2;

④4-
4
5
÷4-
4
5

=4-
1
5
-
4
5

=4-(
1
5
+
4
5
),
=4-1,
=3;

13
5
×8×
8
13
×1.25
=(
13
5
×
8
13
)×(8×1.25),
=
8
5
×10,
=16;

⑥2.9÷8+1.1×
1
8

=2.9×
1
8
+1.1×
1
8

=(2.9+1.1)×
1
8

=4×
1
8

=
1
2
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