问题 解答题
灵活计算.
7
8
×0.375+
3
8
÷
8
9
12
7
-(
5
7
+
1
2
[1-(
1
4
+
3
8
)]÷
1
4
1
8
×58+
1
8
×42
5
9
×6+
4
9
÷
1
6
180÷2.5÷4.
答案

(1)
7
8
×0.375+
3
8
÷
8
9

=

3
8
×(
7
8
+
9
8
),

=

3
8
×2,

=

3
4

(2)

12
7
-(
5
7
+
1
2
),

=

12
7
-
5
7
-
1
2

=

1
2

(3)[1-(

1
4
+
3
8
)]÷
1
4

=[1-

5
8
]÷
1
4

=

3
8
×4,

=

3
2

(4)

1
8
×58+
1
8
×42,

=

1
8
×(58+42),

=

1
8
×100,

=12.5;

(5)

5
9
×6+
4
9
÷
1
6

=6×(

5
9
+
4
9
),

=6;

(6)180÷2.5÷4,

=180÷(2.5×4),

=180÷10,

=18.

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