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caranya yang pembilang diubah jadi (x-3y)(x-3y)
yang penyebutnya diubah jadi x(x-3y)
terus disederhanain jadinya = (x-3y) / x
-------------------
20m²n - 16mn²
= 4mn
--------------------
4mn(5m - 4n)
= 1
----------------
5m - 4n
7) 5p - 5q
-------------
p² - pq
= 5(p-q)
-------------
p(p-q)
= 5/p
8) p² + pr
-------------
pq + qr
= p(p+r)
-----------
q(p+r)
= p/q
9) p - q
----------
p² - q²
= p - q
--------------
(p - q)(p+q)
= 1
----------
p + q