1)3x⁴-5x³+x²
2)2a²b³x+3abxc-a²b²x
3) -6x³y³+10x³y²+4x²y³
4)28m³n⁴x+20m⁵n²x+32m³npx
5)21x⁴y³-28x⁵y²
6)55m⁵n³+35m³n⁵x-10m²n⁶x
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Verified answer
1)3x⁴-5x³+x²
2)2a²b³x+3abxc-a²b²x
3) -6x³y³+10x³y²+4x²y³
4)28m³n⁴x+20m⁵n²x+32m³npx
5)21x⁴y³-28x⁵y²
6)55m⁵n³+35m³n⁵x-10m²n⁶x