1. 6(5x²-3xy-2y²)-4(2x²+2xy-3y²)=….

1. 6(5x²-3xy-2y²)-4(2x²+2xy-3y²)
30x² -18xy -12y² -8x² -8xy -12y²
22x² – 26xy – 24y²

2. 3(7xy²-9x²y-11 xy) dan 5(-6x²y+3 xy²-7xy)
21xy² -27x²y -33xy + (-30x²y) + 15xy² -35xy
36xy² – 57x²y -68xy