32-33题,。
1个回答
2015-10-16
展开全部
26、5x^2+6xy-8y^2
=5x^2+10xy-4xy-8y^2
=5x(x+2y)-4y(x+2y)
=(x+2y)(5x-4y)
27、2x^2+15x+7
=(2x+1)(x+7)
29、5x^2+7x-6
=(x+2)(5x-3)
30、5a^2b^2+23ab-10
=(5ab-2)(ab+5)
32、4x^2y^2-5x^2y^2-9y^2
=y²(4x⁴-5x²-9)
=y²(x²+1)(4x²-9)
=y²(x²+1)(2x+3)(2x-3)
33、4n^2+4n-15
=(2n+5)(2n-3)
=5x^2+10xy-4xy-8y^2
=5x(x+2y)-4y(x+2y)
=(x+2y)(5x-4y)
27、2x^2+15x+7
=(2x+1)(x+7)
29、5x^2+7x-6
=(x+2)(5x-3)
30、5a^2b^2+23ab-10
=(5ab-2)(ab+5)
32、4x^2y^2-5x^2y^2-9y^2
=y²(4x⁴-5x²-9)
=y²(x²+1)(4x²-9)
=y²(x²+1)(2x+3)(2x-3)
33、4n^2+4n-15
=(2n+5)(2n-3)
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