问题 解答题
计算:
(1)
75
+2
8
-
200

(2)
2
+3
0.5
-
3
3
+8
1
3

(3)8x
x
4
-x2
1
x
-
5
3
9x
+
x3

(4)(
7
+4
3
)(
7
-4
3
)-(3
5
-1)

(5)
a3b
-
ab3
-a2
b
a
+
ab
答案

(1)

75
+2
8
-
200

=5

3
+4
2
-10
2

=5

3
-6
2

(2)

2
+3
0.5
-
3
3
+8
1
3

=

2
+
3
2
2
-
3
3
+
8
3
3

=

11
2
2
+
7
3
3

(3)8x

x
4
-x2
1
x
-
5
3
9x
+
x3

=8x

x
2
-x
x
-5
x
+x
x

=(4x-5)

x

(4)(

7
+4
3
)(
7
-4
3
)-(3
5
-1)

=7-(4

3
2-3
5
+1

=-40-3

5

(5)

a3b
-
ab3
-a2
b
a
+
ab

=|a|

ab
-|b|
ab
-|a|
ab
+
ab

=(1-|b|)

ab

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