题目内容

下面各题怎样简便怎样算.
401-
1
7
-
2
7
-
4
7

[1-(
1
2
-
1
3
)]×
24
35

0.85×102
2
5
×18+0.4×32
35÷
7
8
×1-
2
7
2
3
÷(1-
3
4
×
5
6
(1)401-
1
7
-
2
7
-
4
7

=401-(
1
7
+
2
7
+
4
7
),
=401-1,
=400;

(2)[1-(
1
2
-
1
3
)]×
24
35

=[1-
1
6
24
35

=
5
6
×
24
35

=
4
7


(3)0.85×102,
=0.85×(100+2),
=0.85×100+0.85×2,
=85+1.7,
=86.7;

(4)
2
5
×18+0.4×32,
=0.4×(18+32),
=0.4×50,
=20;

(5)35÷
7
8
×1-
2
7

=40×1-
2
7

=40-
2
7

=39
5
7


(6)
2
3
÷(1-
3
4
×
5
6
),
=
2
3
÷(1-
5
8
),
=
2
3
÷
3
8

=
16
9
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