题目内容

计算或化简:
(1)(
45
+
18
)-(
8
-
125
)

(2)(
5
+
6
)(
5
-
6
)

(3)
27
-
45
-
20
+
75

(4)
5
×(
10
-
5
)

(5)a
3
a
+
9a
-
3
a
3

(6)
8
-1
2

(7)
8ab
×
6ab3

(8)
25
4
y
+
16y
-
9y

(9)(2
3
+
5
)(2
3
-
5
)

(10)(
3
+1)2-2
48
(1)原式=3
5
+3
2
-2
2
+5
5

=8
5
+
2


(2)原式=(
5
2-(
6
2
=5-6
=-1;

(3)原式=3
3
-3
5
-2
5
+5
3

=8
3
-5
5

(4)原式=
5
×
10
-
5
×
5

=5
2
-5;

(5)原式=a•
3a
a
+3
a
-
3
3a
3

=
3a
+3
a
-
3a

=3
a


(6)原式=
(
8
-1)×
2
2
×
2

=
4-
2
2


(7)原式=
8ab•6ab3

=4
3
ab2

(8)原式=
5
2
y
+4
y
-3
y

=
7
2
y


(9)原式=(2
3
2-(
5
2
=12-5
=7;

(10)原式=3+2
3
+1-8
3

=4-6
3
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