упростите a.(3-5a^2)-(4-7a^2)
б.(-5ab+4)-(2ab+4)
в.x^2+xy+y^3-(2x^2-xy+2y^3)+(3x^3-2xy-y^2)
б.(-5ab+4)-(2ab+4)
в.x^2+xy+y^3-(2x^2-xy+2y^3)+(3x^3-2xy-y^2)
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