计算:(1)x2-y2x-y(2)a2a+1-1a+1(3)(1+y-3y+3)÷2yy2-9(4)4xy2z÷(-2x-2yz-1)2.-数学

题目简介

计算:(1)x2-y2x-y(2)a2a+1-1a+1(3)(1+y-3y+3)÷2yy2-9(4)4xy2z÷(-2x-2yz-1)2.-数学

题目详情

计算:
(1)
x2-y2
x-y

(2)
a2
a+1
-
1
a+1

(3)(1+
y-3
y+3
2y
y2-9

(4)4xy2z÷(-2x-2yz-12
题型:解答题难度:中档来源:不详

答案

(1)原式=
(x-y)(x+y)
x-y
(2分)
=x+y(4分)
(2)原式=
(a-1)(a+1)
a+1
(2分)
=a-1 (4分)
(3)原式=class="stub"2y
y+3
(y-3)(y+3)
2y
(2分)
=y-3(4分)
(4)原式=4xy2z÷4x-4y2z-2(2分)
=x5z3(4分).
故答案为x+y、a-1、y-3、x5z3.

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