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> 计算:(1)(x-y+4xyx-y)•(x+y-4xyx+y)(2)1x2+3x+2+1x2+5x+6+1x2+7x+12.-数学
计算:(1)(x-y+4xyx-y)•(x+y-4xyx+y)(2)1x2+3x+2+1x2+5x+6+1x2+7x+12.-数学
题目简介
计算:(1)(x-y+4xyx-y)•(x+y-4xyx+y)(2)1x2+3x+2+1x2+5x+6+1x2+7x+12.-数学
题目详情
计算:
(1)
(x-y+
4xy
x-y
)•(x+y-
4xy
x+y
)
(2)
1
x
2
+3x+2
+
1
x
2
+5x+6
+
1
x
2
+7x+12
.
题型:解答题
难度:中档
来源:不详
答案
(1)
(x-y+
class="stub"4xy
x-y
)•(x+y-
class="stub"4xy
x+y
)
=
(x+y
)
2
x-y
•
(x-y
)
2
x+y
=(x+y)(x-y)
=x2-y2;
(2)
class="stub"1
x
2
+3x+2
+
class="stub"1
x
2
+5x+6
+
class="stub"1
x
2
+7x+12
=
class="stub"1
(x+1)(x+2)
+
class="stub"1
(x+2)(x+3)
+
class="stub"1
(x+3)(x+4)
=
x
2
+7x+12+
x
2
+5x+4+
x
2
+3x+2
(x+1)(x+2)(x+3)(x+4)
=
3(x+2)(x+3)
(x+1)(x+2)(x+3)(x+4)
=
class="stub"3
x
2
+5x+4
.
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题目简介
计算:(1)(x-y+4xyx-y)•(x+y-4xyx+y)(2)1x2+3x+2+1x2+5x+6+1x2+7x+12.-数学
题目详情
(1)(x-y+
(2)
答案
=
=(x+y)(x-y)
=x2-y2;
(2)
=
=
=
=