Замените звездочки такими одночленами,чтобы образовалось тождество:1) (x-y)×*=x^2y^2-x^3y;2) (-9x^2+*)×y=*+y^4; 3) (1,4x-*)×3x=*-0,6x^3; 4) *(*-x^2y^5+5y^6)=8x^3y^3+5x^3y^8-*. С объяснением!
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