(1)4(a-b)²-(a+b)² (2) a³(x+y)²-4a³c² 急
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(1)4(a-b)²-(a+b)² (2) a³(x+y)²-4a³c² 急
(1)4(a-b)²-(a+b)² (2) a³(x+y)²-4a³c² 急
(1)4(a-b)²-(a+b)² (2) a³(x+y)²-4a³c² 急
(1)4(a-b)²-(a+b)²
=(2a-2b+a+b)(2a-2b-a-b)
=(3a-b)(a-3b)
(2) a³(x+y)²-4a³c²
=a³[(x+y)²-4c²]
=a³(x+y+2c)(x+y-2c)
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(1)4(a-b)²-(a+b)²
=[2(a-b)+(a+b)][2(a-b)-(a+b)]
=(3a-b)(a-3b)
(2) a³(x+y)²-4a³c²
=a³[(x+y)²-4c²]
=a³(x+y+2c)(x+y-2c)
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