спростіть вираз;
1) 1/6 x³y²(-1. 2/7 xy)²
2) 3x²-6 x + x²-3+x
3) 8a²+4a-3-(7-8a+3a²)
4) (10-3m)(2+3m)+(5m-4)(5-2m)
5) (n-1)(n²+n+1)-n³ 6) (2x²-4x+8)(-0,5x²)
7) (5x-2y)(5x+2y)

допоможіть будь ласка!!!​ ​
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