题目内容

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
(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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