1. , применив формулы сокращённого умножения: а) (m¼ - n½)² - (m¼ + n½)²; б) (m⅓ + 3n½)² + (m⅓ - 3n½)²; в) (m½ - 2n¼) (m½ + 2n¼); г) (m½ - 3n) (m + 3m½n + 9n²).

А) (m¼ - n½)² - (m¼ + n½)²=m^1/2-2(mn)^1/4+n^1/2+m^1/2+2(mn)^1/4+n^1/2=
=2√m+2√n
б) (m⅓ + 3n½)² + (m⅓ - 3n½)²=
=m^2/3+6m^1/3n^1/2+9n+m^2/3-6m^1/3n^1/2+9n=2∛m²+18n
в) (m½ - 2n¼) (m½ + 2n¼)=m-4√n
г) (m½ - 3n) (m + 3m½n + 9n²)=m^3/2-27n³=√m³-27n³