数学分解因式3a²x²-15a²xy-42a²y²
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数学分解因式3a²x²-15a²xy-42a²y²
数学分解因式3a²x²-15a²xy-42a²y²
数学分解因式3a²x²-15a²xy-42a²y²
3a²x²-15a²xy-42a²y²
=3a²(x²-5xy-14y²)提公因式
=3a²(x-7y)(x+2y)
ok了
3a²x²-15a²xy-42a²y²=3a²(x²-5xy-14y²)=3a²(x-7y)(x+2y)
3a²x²-15a²xy-42a²y²
=3a²(x²-5xy-14y²)
=3a²(x-7y)(x+2y)
3 (a\.b2x\.b2 - 5 a\.b2xy - 14 a\.b2y\.b2)