1) х-2у-а(2у-х) = х - 2у - 2ау + ах = х + ах - 2у - 2ау = х(1 + а) - 2у(1 + 2а)
2) 4(3а+2в)^2 - (3а-2в)^2 = 4(9а^2 + 12ав + 4в^2) - (9а^2 - 12ав + 4в^2) = 36а^2 + 48ав + 16в^2 - 9а^2 + 12ав - 4в^2 = 27а^2 + 60ав + 12в^2
2) 4(4-у^2)(у^2+4)-(5-у^3)^2+(4^4+4^2y+16)(y^2-4) = 4(16 - 4у^2)(у^2 + 4) - (25 - 10у^3 + у^6) + (256 + 16y + 16)(у^2 - 4) = 4(64 - 16у^2 + 64 - 16у^2) - 25 + 10у^3 - у^6 + 256 - 64y + 64у^2 - 1024
3) 2x - 8 = 02x = 8x = 8/2x = 4
1) х-2у-а(2у-х) = х - 2у - 2ау + ах = х + ах - 2у - 2ау = х(1 + а) - 2у(1 + 2а)
2) 4(3а+2в)^2 - (3а-2в)^2 = 4(9а^2 + 12ав + 4в^2) - (9а^2 - 12ав + 4в^2) = 36а^2 + 48ав + 16в^2 - 9а^2 + 12ав - 4в^2 = 27а^2 + 60ав + 12в^2
2) 4(4-у^2)(у^2+4)-(5-у^3)^2+(4^4+4^2y+16)(y^2-4) = 4(16 - 4у^2)(у^2 + 4) - (25 - 10у^3 + у^6) + (256 + 16y + 16)(у^2 - 4) = 4(64 - 16у^2 + 64 - 16у^2) - 25 + 10у^3 - у^6 + 256 - 64y + 64у^2 - 1024
3) 2x - 8 = 0
2x = 8
x = 8/2
x = 4