3a²x²-15a²xy-42a²y² 因式分解
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3a²x²-15a²xy-42a²y² 因式分解
3a²x²-15a²xy-42a²y² 因式分解
3a²x²-15a²xy-42a²y² 因式分解
3a²(x²-5xy-14y²)
=3a²(x-7y)(x+2y)
3a²x²-15a²xy-42a²y²
=3a^2(x^2-5xy-14y^2)
=3a²(x-7y)(x+2y)