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BAB ALJABAR
18.(7xy^2-9x^2y+11xy)+(5x^2y-7xy-3xy^2)
4xy^2-4x^2y+4xy
4(xy^2-x^2y+xy)
jawabannya B
21.(y+5)(y+3)
y^2+3y+5y+15
y^2+8y+15
jawabannya A
22.(m-3)(m+7)
m^2+7m-3m-21
m^2+4m-21
jawabannya D
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