题目内容

用递等式计算(能简算的要简算)
(1)2842÷14+74×3;
(2)
3
7
+
5
13
-
3
7
+
5
13

(3)88+99×88;
(4)(
4
5
+
1
4
)÷
7
3
+
7
10
(1)2842÷14+74×3,
=203+222,
=425;

(2)
3
7
+
5
13
-
3
7
+
5
13

=(
3
7
-
3
7
)+(
5
13
+
5
13
),
=0+
10
13

=
10
13


(3)88+99×88,
=88×(1+99),
=88×100,
=8800;

(4)(
4
5
+
1
4
)÷
7
3
+
7
10

=
21
20
×
3
7
+
7
10

=
9
20
+
14
20

=
23
20
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