(x+2y)(x-2y)*(x²-4y²)其中x=三分之五 y=三分之二
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(x+2y)(x-2y)*(x²-4y²)其中x=三分之五 y=三分之二
(x+2y)(x-2y)*(x²-4y²)其中x=三分之五 y=三分之二
(x+2y)(x-2y)*(x²-4y²)其中x=三分之五 y=三分之二
原式 = (x + 2 y)(x - 2 y)(x + 2 y)(x - 2 y)
= (x + 2 y)² (x - 2 y)²
当 x = 5 / 3 ,y = 2 / 3 时,原式 = (5 / 3 + 2 × 2 / 3)² (5 / 3 - 2 × 2 / 3)²
=(5 / 3 + 4 / 3)²(5 / 3 - 4 / 3)²
= (9 / 3)²(1 / 3)²
= 3 ² × 1 / 3 ²
= 1