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
=
(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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