1/x-1/y=1/xy, maka 2x-2y= A.1 B.-1 C.-2 D.2

kedua ruas kita kali dengan xy maka diperoleh
y-x = 1
-(x-y) = 1
x-y = -1
2x - 2y = 2×-1 = -2

◾ Materi : Aljabar
◾ Sub materi : Aljabar
◾ Mapel : Matematika

Jawab :
1/x - 1/y = 1/xy
-------------------- x (xy)
xy/x - xy/y = xy/xy
y - x = 1
------------ x (-1)
-y + x = -1
x - y = -1
-------------- x 2
2x - 2y = -2

Jawaban : C
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-vin