3(x-4y)(-x-4y)-2(x+2y)²
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![3(x-4y)(-x-4y)-2(x+2y)²](/uploads/image/z/4319245-37-5.jpg?t=3%28x-4y%29%28-x-4y%29-2%28x%2B2y%29%26%23178%3B)
3(x-4y)(-x-4y)-2(x+2y)²
3(x-4y)(-x-4y)-2(x+2y)²
3(x-4y)(-x-4y)-2(x+2y)²
原式=3(x-4y)(-x-4y)-2(x+2y)²
=-3(x-4y)(x+4y)-2(x²+4xy+4y²)
=-3(x²-16y²)-2x²-8xy-8y²
=-3x²+48y²-2x²-8xy-8y²
= -5x²-8xy+40y²
f