(1)x(y-5)+2(5-y) (2)(2a-3b)(2a+b)-5a(b+2a)
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(1)x(y-5)+2(5-y) (2)(2a-3b)(2a+b)-5a(b+2a)
(1)x(y-5)+2(5-y) (2)(2a-3b)(2a+b)-5a(b+2a)
(3)(m-2n)^2-n^2 (4)x^4-16x^2y^2 (5)9-12(x-y)+4(x-y)^2
(1)x(y-5)+2(5-y) (2)(2a-3b)(2a+b)-5a(b+2a)
(3)(m-2n)^2-n^2 (4)x^4-16x^2y^2 (5)9-12(x-y)+4(x-y)^2
(1)x(y-5)+2(5-y)
=(y-5)(x-2)
(2)(2a-3b)(2a+b)-5a(b+2a)
=(2a+b)(2a-3b-5a)
=3(2a+b)(a+b)
(3)(m-2n)^2-n^2
=(m-2n-n)((m-2n+n)
=(m-3n)(m-n)
(4)x^4-16x^2y^2
=(x²-4xy)(x²+4xy)
=x²(x-4y)(x+4y)
(5)9-12(x-y)+4(x-y)^2
=(2(x-y)-3)²
=(2x-2y-3)²
=(y-5)(x-2)
(2)(2a-3b)(2a+b)-5a(b+2a)
=(2a+b)(2a-3b-5a)
=3(2a+b)(a+b)
(3)(m-2n)^2-n^2
=(m-2n-n)((m-2n+n)
=(m-3n)(m-n)
(4)x^4-16x^2y^2
=(x²-4xy)(x²+4xy)
=x²(x-4y)(x+4y)
(5)9-12(x-y)+4(x-y)^2
=(2(x-y)-3)²
=(2x-2y-3)²
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