题目内容

计算
(1)[5-3
22
63
÷(1
1
4
+2.25×
4
5
)]÷12.5%
(2)[2-(8.25-5
π
2
)×
π
2
]÷0.9
(3)(20
π
2
+12.56-31
π
2
)÷299+(13
2
5
-12.25)×1
4
5

(4)
1
25
×(4.85÷
4
5
-3.6+6.15×3
8
9
)+1.75×(1
2
3
+
1
3
)+5.5.
(1)[5-3
22
63
÷(1
1
4
+2.25×
4
5
)]÷12.5%,
=[5-3
22
63
÷(1
1
4
+
9
5
)]÷12.5%,
=[5-3
22
63
÷
61
20
]÷12.5%,
=[5-
4220
3843
]÷12.5%,
=
14995
3843
×8,
=
119960
3843


(2)[2-(8.25-5
π
2
)×
π
2
]÷0.9,
=[2-1.68×1.57]÷0.9,
=[2-2.6376]÷0.9,
=[-0.6376]÷0.9,
=-
63790
90000


(3)(20
π
2
+12.56-31
π
2
)÷299+(13
2
5
-12.25)×1
4
5

=(20
π
2
+12.56-31
π
2
)÷299+1.15×1
4
5

=(12.56-11)÷299+2.07,
=1.56÷299+2.07,
=
3
575
+2
7
100

=2
173
2300


(4)
1
25
×(4.85÷
4
5
-3.6+6.15×3
8
9
)+1.75×(1
2
3
+
1
3
)+5.5,
=
1
25
×(
97
16
-3.6+
287
12
)+1.75×2+5.5,
=
1
25
×(
97
16
-3
3
5
+
287
12
)+1.75×2+5.5,
=
1
25
×(
197
80
+
287
12
)+3.5+5.5,
=
1
25
×
6331
80
+9,
=
6331
2000
+9,
=9
6331
2000
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