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> 计算：（1）1220-5215+515+45-12405；（2）43-118+13-7198；（3）b+a3b-（b3+1ab）；（4）x4y4-x2y2-xy2+y3x-y(x＞y＞0)．-数学
计算：（1）1220-5215+515+45-12405；（2）43-118+13-7198；（3）b+a3b-（b3+1ab）；（4）x4y4-x2y2-xy2+y3x-y(x＞y＞0)．-数学
题目简介
计算：（1）1220-5215+515+45-12405；（2）43-118+13-7198；（3）b+a3b-（b3+1ab）；（4）x4y4-x2y2-xy2+y3x-y(x＞y＞0)．-数学
题目详情
计算：
（1）
1
2
20
-
5
2
1
5
+5
1
5
+
45
-
1
2
405
；
（2）
4
3
-
1
18
+
1
3
-7
1
98
；
（3）
b
+
a
3
b
-（
b
3
+
1
ab
）；
（4）
x
4
y
4
-
x
2
y
2
-
x
y
2
+
y
3
x-y
(x＞y＞0)
．
题型：解答题
难度：中档
来源：不详
答案
原式=
5
-
class="stub"1
2
+
5
+3
5
-
class="stub"9
2
5
，
=
class="stub"1
2
5
-
class="stub"1
2
．
（2）原式=
class="stub"2
3
3
-
class="stub"1
6
2
+
class="stub"1
3
3
-
class="stub"1
2
2
，
=
3
-
class="stub"2
3
2
．
（3）原式=
b
+a
ab
-b
b
-
class="stub"1
ab
ab
，
=（1-b）
b
+（a-
class="stub"1
ab
）
ab
．
（4）原式=-
x
4
-
x
2
y
2
y
4
-
x
y
2
+
y
3
x-y
，
=
class="stub"x
y
2
x
2
-
y
2
-
class="stub"y
x-y
x
2
-
y
2
，
=（
class="stub"x
y
2
-
class="stub"y
x-y
）
x
2
-
y
2
．
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题目简介
计算：（1）1220-5215+515+45-12405；（2）43-118+13-7198；（3）b+a3b-（b3+1ab）；（4）x4y4-x2y2-xy2+y3x-y(x＞y＞0)．-数学
题目详情
（1）
（2）
（3）
（4）
答案
=
（2）原式=
=
（3）原式=
=（1-b）
（4）原式=-
=
=（