Question

упростите выражение (2-3х-4х2)+(-х2+3х+2)
(5х+у2-z)-(х2-3у)
(3х+0,25х3у-2,3.4)*(-4х2у)

Answer 1

1.2-3х-4х^2-х^2+3х+2=4-5х^2
2.5x+y^2-z-x^2+3y
3.(3x+0,25x^3y-9,2)•(-8xy)=(3x+0,25x^3y-9,2)•(-8)xy=-24x^2y-2x^4y^2+73,6xy