题目内容

4
1
3
+3.2+5
2
3
+6.8=
25×(8×0.4)×1.25=
7
4
15
-(2
4
15
-
1
23
)=
11
12
+
7
18
+
5
24
)×72=
93.5÷3
1
2
÷
2
7

16÷2.5=.
(1)4
1
3
+3.2+5
2
3
+6.8,
=4
1
3
+3
1
5
+5
2
3
+6
4
5

=(4
1
3
+5
2
3
)+(3
1
5
+6
4
5
),
=10+10,
=20;
(2)25×(8×0.4)×1.25,
=(25×0.4)×(8×1.25),
=10×10,
=100;
(3)7
4
15
-(2
4
15
-
1
23
),
=7
4
15
-2
4
15
+
1
23

=5+
1
23

=5
1
23

(4)(
11
12
+
7
18
+
5
24
)×72,
=
11
12
×
72+
7
18
×
72+
5
24
×
72,
=66+28+15,
=109;
(5)93.5÷3
1
2
÷
2
7

=93
1
2
÷3
1
2
÷
2
7

=93
1
2
÷(
2
7
×
7
2
),
=93
1
2
÷1,
=93
1
2

(6)16÷2.5,
=(16×4)÷(2.5×4),
=64÷10,
=6.4.
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