(1)a²-1/25b² (2)9a²-4b² (3)x²y-4y (
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(1)a²-1/25b² (2)9a²-4b² (3)x²y-4y (4)-a^4+16 (5)15a^3+10a^2
(6)12abc-3bc^2 (7)6p(p+q)-4q(p+q) (8)m(a-3)+2(3-a) (9)1-36b^2
(10)12x^2-3y^2 (11)0.49^2-144 (12)(2x+y)^2-(x+2y)^2
(6)12abc-3bc^2 (7)6p(p+q)-4q(p+q) (8)m(a-3)+2(3-a) (9)1-36b^2
(10)12x^2-3y^2 (11)0.49^2-144 (12)(2x+y)^2-(x+2y)^2
(1)a²-1/25b²
=(a+b/5)(a-b/5)
(2)9a²-4b²
=(3a+2b)(3a-2b)
(3)x²y-4y
=y(x²-4)
=y(x+2)(x-2)
(4)-a^4+16
=16-a^4
=(4+a²)(4-a²)
=(4+a²)(2+a)(2-a)
(5)15a^3+10a^2
=5a²(3a+2)
(6)12abc-3bc^2
=3bc(4a-c)
(7)6p(p+q)-4q(p+q)
=2(p+q)(3p-2q)
(8)m(a-3)+2(3-a)
=m(a-3)-2(a-3)
=(a-3)(m-2)
(9)1-36b^2
=(1+6b)(1-6b)
(10)12x^2-3y^2
=3(4x²-y²)
=3(2x+y)(2x-y)
(11)0.49^2-144 加了一个x
=(0.7x-12)(0.7x+12)
(12)(2x+y)^2-(x+2y)^2
=(2x+y+x+2y)(2x+y-x-2y)
=3(x+y)(x-y)
=(a+b/5)(a-b/5)
(2)9a²-4b²
=(3a+2b)(3a-2b)
(3)x²y-4y
=y(x²-4)
=y(x+2)(x-2)
(4)-a^4+16
=16-a^4
=(4+a²)(4-a²)
=(4+a²)(2+a)(2-a)
(5)15a^3+10a^2
=5a²(3a+2)
(6)12abc-3bc^2
=3bc(4a-c)
(7)6p(p+q)-4q(p+q)
=2(p+q)(3p-2q)
(8)m(a-3)+2(3-a)
=m(a-3)-2(a-3)
=(a-3)(m-2)
(9)1-36b^2
=(1+6b)(1-6b)
(10)12x^2-3y^2
=3(4x²-y²)
=3(2x+y)(2x-y)
(11)0.49^2-144 加了一个x
=(0.7x-12)(0.7x+12)
(12)(2x+y)^2-(x+2y)^2
=(2x+y+x+2y)(2x+y-x-2y)
=3(x+y)(x-y)
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