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(----- - 1 ) : ( x + --------- - y) ---> sama kan penyebutnya jadi x + y
x+y x + y
2x - ( x + y) x(x+y) + 2xy - y(x+y)
(---------- ----- ) : --------------------------
x + Y x + y
2x - x - y x²+xy + 2xy - xy - y²
----------- : ---------------------------
x + y x + y
x - y x² + 2xy - y²
------- : -----------------
x + y x + y
x - y x + y
------ x -------------- ------> x + y di coret
x + y x² + 2xy - y²
x - y
------------
x² + 2xy - y²