问题 解答题
1
2
3
+0.5
=
7
8
-0.75
=
5
21
÷4
1
5
=
(
7
8
+
3
4
)×8
=
5
3
4
+3.42+4
1
4
=
99×0.25+0.25=5.73-1
7
12
+1
7
12
=
7.2÷100-0.72÷10=
2
3
×0.75+
1
3
×
3
4
=
4.85-
7
12
-3
5
12
=
答案

(1)1

2
3
+0.5,

=1

2
3
+
1
2

=

13
6

(2)

7
8
-0.75,

=0.875-0.75,

=0.125;

(3)

5
21
÷4
1
5

=

5
21
×
5
21

=

25
441

(4)(

7
8
+
3
4
)×8,

=

7
8
×8+
3
4
×8,

=7+6,

=13;

(5)5

3
4
+3.42+4
1
4

=(5

3
4
+4
1
4
)+3.42,

=10+3.42,

=13.42;

(6)99×0.25+0.25,

=(99+1)×0.25,

=100×0.25,

=25;

(7)5.73-1

7
12
+1
7
12

=5.73+(1

7
12
-1
7
12
),

=5.73+0,

=5.73;

(8)7.2÷100-0.72÷10,

=0.072-0.072,

=0;

(9)

2
3
×0.75+
1
3
×
3
4

=(

2
3
+
1
3
)×
3
4

=1×

3
4

=

3
4

(10)4.85-

7
12
-3
5
12

=4.85-(

7
12
+3
5
12
),

=4.85-4,

=0.85.

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