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dikalikan 2m x (4m-3) - 3 x (m-2n) =8m^2-6m-3m+6n
operasikan yg sejenis =8m^2(-6m-3m)+6
hasilnya =8m^2-9m+6n
b. 7+[3x(4y-x)] [-5y(1-1)]+5x^2
yg dikurung dikalikan = 7y +[ 12xy-3x^2] [-5y+5y]+5x^2
operasikan yg sejenis =7y-5y+5y+12xy-3x^2+5x^2
hasilnya= 7y+12xy-2x^2
smoga membantu...