1) (7m2- 4mn -n²)-(2m²- mn+n²). 2) (5a² -11ab +8b²)+(- 2b² — 7a² + 5ab). 3) (-2x³ + xy²)+(x²y — 1)+(x²y-1)+(x²y-xy²+3x³). 4) (3x²+5xy + 7x²y) — (5xy +3x²)- (7x²y- 3x²).
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