Упростите выражение!!!!!! СРОЧНО!!!!!!!​

Ответ:

1) (3x²-2x)+(-x²+3x)=>3x²-2x-x²+3x=>2x²-2x+3x=>

=>2x²+x

2) (4c²-2cd)-(10c²+8cd)=>4c²-2cd-10c²-8cd=>

=>-6c²-2cd-8cd=>-6c²-10cd

3) (12m²-7n-3mn)-(6mn-10n+14m²)=>

=>12m²-7n-3mn-6mn+10n-14m²=>

=>-2m²-7n-3mn-6mn+10n=-2m²+3n-3mn-6mn

=>-2m²+3n-9mn

4) (3n³-2mn+4m³)-(2mn+3n³)=>

=>3n³-2mn+4m³-2mn-3n³=>-2mn+4m³-2mn=>

=>-4m+4m³