问题 解答题
用递等式计算
(1)1379+450÷18×40
(2)(3.2÷16+10.8)÷22
(3)
5
11
×
7
25
+
7
25
×
6
11

(4)
1
4
×
1
7
÷(
5
6
-
3
4
答案

(1)1379+450÷18×40,

=1379+25×40,

=1379+1000,

=2379;

(2)(3.2÷16+10.8)÷22,

=(0.2+10.8)÷22,

=11÷22,

=0.5;

(3)

5
11
×
7
25
+
7
25
×
6
11

=(

5
11
+
6
11
)×
7
25

=1×

7
25

=

7
25

(4)

1
4
×
1
7
÷(
5
6
-
3
4
),

=

1
4
×
1
7
÷
1
12

=

1
4
×
1
7
×12,

=

1
4
×12×
1
7

=3×

1
7

=

3
7

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