题目内容

用简便方法计算,要写出简算过程
31
7
-(3.19+
3
7
94×99
4
5
-
3
4
)÷
1
25
+0.8
10-
9
13
÷
3
26
+5.2.
(1)
31
7
-(3.19+
3
7
),
=
31
7
-
3
7
-3.19,
=4-3.19,
=0.81;

(2)94×99,
=94×(100-1),
=94×100-94×1,
=9400-94,
=9306;

(3)(
4
5
-
3
4
)÷
1
25
+0.8,
=
1
20
÷
1
25
+0.8,
=
5
4
+0.8,
=2.05;

(4)10-
9
13
÷
3
26
+5.2,
=10-6+5.2,
=4+5.2,
=9.2.
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