Toán Lớp 8: 36x²-(8a-b)²
27x³-a³b³
Giúp mik nhà ????????
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Toán Lớp 8: 36x²-(8a-b)²
27x³-a³b³
Giúp mik nhà ????????
Comments ( 2 )
=(6x)^2-(8a-b)^2
=[6x-(8a-b)][6x+(8a-b)]
=(6x-8a+b)(6x+8a-b)
=(3x)^3-(ab)^3
=(3x-ab)[(3x)^2+3xab+(ab)^2]
=(3x-ab)(9x^2+3xab+a^2b^2)
$=(6x)^2-(8a-b)^{2}$
$=(6x-8a+b)(6x+8a-b)^{}$
$=(3x)^3-(ab)^{3}$
$=(3x-ab)(9x^2+3xab+a^2b^2)^{}$