问题 解答题
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
答案

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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