求救..分组分解法的数学题 1.7x^2-3y+xy-21x 2.4x^2-a^2-6a-9 3.a^2-6ab+5b^2 4.3a-6b-a^2+4ab-4b^21.7x^2-3y+xy-21x2.4x^2-a^2-6a-93.a^2-6ab+5b^24.3a-6b-a^2+4ab-4b^2

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