问题 解答题

7.08÷(1.25×0.8)=
5
9
-
5
6
+
4
9
=
3
5
×
2
5
÷
3
5
×
2
5
=
5.38-(2.1+2.38)=
1
7
-
1
9
)×63=
0.5×(2.6-2.4)=(0.18+0.9)÷0.9=3-
8
15
-
7
15
=
答案

(1)7.08÷(1.25×0.8),

=7.08÷1,

=7.08;

(2)

5
9
-
5
6
+
4
9

=

5
9
+
4
9
-
5
6

=1-

5
6

=

1
6

(3)

3
5
×
2
5
÷
3
5
×
2
5

=

3
5
×
2
5
×
5
3
×
2
5

=(

3
5
×
5
3
)×(
2
5
×
2
5
),

=1×

4
25

=

4
25

(4)5.38-(2.1+2.38),

=5.38-2.38-2.1,

=3-2.1,

=0.9;

(5)(

1
7
-
1
9
)×63,

=

1
7
×63-
1
9
×63,

=9-7,

=2;

(6)0.5×(2.6-2.4),

=0.5×0.2,

=0.1;

(7)(0.18+0.9)÷0.9,

=1.08÷0.9,

=1.2;

(8)3-

8
15
-
7
15

=3-(

8
15
+
7
15
),

=3-1,

=2.

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