题目内容

能简算的要简算.
3.2×1.25×0.25
5.8×[1÷(2.1-2.09)]
31
50
×101-
31
50
42÷(
1
2
+
2
3
3
4
×
7
8
+
1
8
×75%
7
8
-
5
16
)×(
5
9
+
2
3
3.2×1.25×0.25,
=(0.8×1.25)×(4×0.25),
=1×1,
=1;

5.8×[1÷(2.1-2.09)],
=5.8×[1÷0.01],
=5.8×100,
=580;

31
50
×101-
31
50

=
31
50
×
(101-1),
=
31
50
×
100,
=62;

42÷(
1
2
+
2
3
),
=42÷
7
6

=42×
6
7

=36;

3
4
×
7
8
+
1
8
×75%,
=0.75×(
7
8
+
1
8
),
=0.75×1,
=0.75;

7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
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