求大神给分解因式,要有过程.在线等 (1)-a^4+16 后面还有(1)-a^4+16(2)(7a^2+2b^2)^2-(7b^2+2c^2)^2(3)9(2a-b)^2-6(2a-b)+1(4)(x+y)^2-14x^2+14y^2+49(x-y)^2(5)(a-2b)^2-3a+6b(6)4x^2-(y-x)^2
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求大神给分解因式,要有过程.在线等 (1)-a^4+16 后面还有(1)-a^4+16(2)(7a^2+2b^2)^2-(7b^2+2c^2)^2(3)9(2a-b)^2-6(2a-b)+1(4)(x+y)^2-14x^2+14y^2+49(x-y)^2(5)(a-2b)^2-3a+6b(6)4x^2-(y-x)^2
求大神给分解因式,要有过程.在线等 (1)-a^4+16 后面还有
(1)-a^4+16
(2)(7a^2+2b^2)^2-(7b^2+2c^2)^2
(3)9(2a-b)^2-6(2a-b)+1
(4)(x+y)^2-14x^2+14y^2+49(x-y)^2
(5)(a-2b)^2-3a+6b
(6)4x^2-(y-x)^2
求大神给分解因式,要有过程.在线等 (1)-a^4+16 后面还有(1)-a^4+16(2)(7a^2+2b^2)^2-(7b^2+2c^2)^2(3)9(2a-b)^2-6(2a-b)+1(4)(x+y)^2-14x^2+14y^2+49(x-y)^2(5)(a-2b)^2-3a+6b(6)4x^2-(y-x)^2
(1)-a^4+16
=4^2-(a^2)^2
=(4+a^2)(4-a^2)
=(4+a^2)(2-a)(2+a)
(2)(7a^2+2b^2)^2-(7b^2+2c^2)^2
=(7a^2+2b^2+7b^2+2c^2)(7a^2+2b^2-(7b^2+2c^2))
=(7a^2+9b^2+2c^2)(7a^2-5b^2-2c^2)
(3)9(2a-b)^2-6(2a-b)+1
=(3(2a-b))^2-2x3(2a-b)x1+1
=(3(2a-b)-1)^2
=(6a-3b-1)^2
(4)(x+y)^2-14x^2+14y^2+49(x-y)^2
=(x+y)^2-14(x^2-y^2)+(7(x-y))^2
=(x+y)^2-2x7(x-y)(x+y)+(7(x-y))^2
=(x+y-7(x-y))^2
=(-6x+8y)^2
(5)(a-2b)^2-3a+6b
=(a-2b)^2-3(a-2b)
=(a-2b)(a-2b-3)
(6)4x^2-(y-x)^2
=(2x)^2-(y-x)^2
=(2x+y-x)(2x-(y-x))
=(x+y)(3x-y)