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/ = per atau bagi
* = kali
1. 8(a + 1)/4a * 3a/(a + 1) --> coret a dan (a + 1) nya
= 6
2. 5(a + 3b)/x²y * xy²/(a + 3b)
= 5xy²/x²y
= 5y/x
3. x(y + 1)/y² * y/3(y + 1)
= x/3y
4. 3(x - 4)/(x + 2)(x + 5) * x(x + 5)/x(x - 4)
= 3/(x + 2)