1.3x^3=ax^22.70y^4-20y^4=5y^3-40y^23.6xy^5=24x^4y^3-18x^2y=3
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1,2,3,4,5 ,6,7,题目乱七八糟
8.x^2+10x+25=(x+5)²
9.x^2+20x+100=(x+10)²
10.ab+ab=2a
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