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=6x²+10xy-56y²
2.(2x²).(5y)= 10x²y
3.(2x).(3x²+5xy-6)=6x³+10x²y-12x
4.(3x²+6).(-7x+6)= -21x³+18x²-42x+36
5.(2x²y-8).(-8x+5y)= -16x³y+10x²y-64-40y