October 2018 1 32 Report
Hasil dari:
a. (7xy² -9x²y +11xy) + (5xy²-7xy-3xy²)
b .(6xy + 3yz+4z)+(2xy+4yz-4z)
c. (7a²+2a) - (6a²-12a)
d. 3(2x-y) - 5(x-y)

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