1. The positive integer solution of inequality 3 [3 + 1] ≥ 5x-3 is {} 2. Factorization 〔1〕-4a^2x+12ax-9x 〔2〕(2x+y)^2-(x+2y)^2

X ≤ 3, so the positive integer solution is {1,2,3}
2.（1）=-x(2a-3)²
(2) =(2x+y+x+2y)(2x+y-x-2y)
=3(x+y)(x-y)

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