题目内容

脱式计算.
6.25-40÷16×2.5
1
12
+(4
5
12
-3
1
2
)÷
11
24
[
3
5
-(
3
4
-
2
5
)]÷4
[0.8×(
3
5
+
27
10
×
8
9
)]÷30%
(1)6.25-40÷16×2.5,
=6.25-2.5×2.5,
=6.25-6.25,
=0;

(2)
1
12
+(4
5
12
-3
1
2
)÷
11
24

=
1
12
+
11
12
÷
11
24

=
1
12
+2,
=2
1
12


(3)[
3
5
-(
3
4
-
2
5
)]÷4,
=[
3
5
+
2
5
-
3
4
]÷4,
=(1-
3
4
)÷4,
=
1
4
÷4,
=
1
16


(4)[0.8×(
3
5
+
27
10
×
8
9
)]÷30%,
=[0.8×(
3
5
+
27
10
×
8
9
)]÷30%,
=[0.8×(
3
5
+
12
5
)]÷30%,
=[0.8×3]÷30%,
=2.4÷0.3,
=8.
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