1)1.4х(0.5х-0.3у)-5(0.4у^2-4ху)+0.2у(8у-5х)=0,7x^2-0,42xy-2y^2+20xy+1,6y^2-xy=0,7x^2-0.4y^2+18.58xy
2)4х-2(х-3)-3(х-3(4-2х)+8)=4x-2x+6-3(x-12+6x+8)=2x+6-3x+36-18x-24=18-19x
3)3х-2((1-3(2х-3-а)-59а-(3х-2а)-4))=3x-2(1-6x+9+3a-59a-3x+2a-4)=3x-2+12x-18-6a+118a+6x-4a+8=21x+108a-12
5)(6а^2+5в^2)(2а^2-4в^2)=12a^4-24a^2b^2+10a^2b^2-20b^4=12a^4-14a^2b-20b^4
4)(7х^3 у^2-ху)(-2х^2 у^2+5ху^3)=-14x⁵y⁴+35x⁴y⁵+2x³y³-5x²y⁴