问题 解答题
用递等式计算,能简算的要简算
7.28-(1.284+0.25)
8×4×12.5×2.5
3
7
×9+
3
7
×12
2618-(486÷18×35)
5
6
-
3
4
)×24-
3
5

3
5
÷((
2
3
+0.2)×
2
13
答案

(1)7.28-(1.284+0.25)

=7.28-(1.284+0.25)

=7.28-1.534

=5.746;

(2)8×4×12.5×2.5

=(8×12.5)×(4×2.5)

=100×10

=1000;

(3)

3
7
×9+
3
7
×12

=

3
7
×(9+12)

=

3
7
×21

=9;

(4)2618-(486÷18×35)

=2618-(27×35)

=2618-945

=1673;

(5)(

5
6
-
3
4
)×24-
3
5

=24×

5
6
-
3
4
×24-
3
5

=20-18-

3
5

=2-

3
5

=1

2
5

(6)

3
5
÷[(
2
3
+0.2)×
2
13
]

=

3
5
÷[(
2
3
+
1
5
)×
2
13
]

=

3
5
÷[
13
15
×
2
13
]

=

3
5
÷
2
15

=

3
5
×
15
2

=

9
2

问答题
问答题 简答题