(1)异分母分式相加减,先______变为______分式,然后再加减.(2)分式2xy,3x+y,4x-y的最简公分母是______.(3)计算:1x2yz-2xy2z+3zyz2=______.(

题目简介

(1)异分母分式相加减,先______变为______分式,然后再加减.(2)分式2xy,3x+y,4x-y的最简公分母是______.(3)计算:1x2yz-2xy2z+3zyz2=______.(

题目详情

(1)异分母分式相加减,先______变为______分式,然后再加减.
(2)分式
2
xy
3
x+y
4
x-y
的最简公分母是______.
(3)计算:
1
x2yz
-
2
xy2z
+
3
zyz2
=______.
(4)计算:
x
x-1
(1+
x-1
x
)
=______.
题型:解答题难度:中档来源:不详

答案

(1)异分母分式相加减,先通分变为同分母分式,然后再加减;
(2)分式class="stub"2
xy
class="stub"3
x+y
class="stub"4
x-y
的最简公分母是xy(x+y)(x-y);
(3)原式=class="stub"yz-2xz+3yz
x2y2z2

(4)原式=class="stub"x
x-1
class="stub"2x-1
x
=class="stub"2x-1
x-1

故答案为:(1)通分;同分母;(2)xy(x+y)(x-y);(3)class="stub"yz-2xz+3yz
x2y2z2
;(4)class="stub"2x-1
x-1

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