Вместо звёздочки запишите такой многочлен, чтобы образовалось тождество:
1) * - (5xy-[tex] x^{2}[/tex]+2[tex] y^{2} [/tex]) = 3[tex] x^{2} [/tex]+xy
2) 5[tex] a^{3} [/tex]-[tex] a^{2} [/tex]+3[tex] a^{4} [/tex]-7+(*) = 2[tex] a^{2} [/tex]-3a
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