题目内容

5-2
1
3
+
2
3
=
(12.5+
3
4
)×8=
19-3
4
9
-4
5
9
=
8+0.1÷0.1-8=
21-2.897=0.25×0.12=3.6÷25%×4=
1
12
÷(
1
2
+
1
3
)
=
(1)5-2
1
3
+
2
3

=2
2
3
+
2
3

=3
1
3


(2)(12.5+
3
4
)×8,
=12.5×8+
3
4
×8,
=100+6,
=106;

(3)19-3
4
9
-4
5
9

=19-(3
4
9
+4
5
9
),
=19-8,
=11;

(4)8+0.1÷0.1-8,
=8+1-8,
=1;

(5)21-2.897,
=21-3+0.103,
=18+0.103,
=18.103;

(6)0.25×0.12,
=0.25×(4×0.03),
=(0.25×4)×0.03,
=1×0.03,
=0.03;

(7)3.6÷25%×4,
=14.4×4,
=57.6;

(8)
1
12
÷(
1
2
+
1
3
)

=
1
12
÷
5
6

=
1
10
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