4(2x+y) -9(x-2y)
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![4(2x+y) -9(x-2y)](/uploads/image/z/1333582-70-2.jpg?t=4%282x%2By%29+-9%28x-2y%29)
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4(2x+y) -9(x-2y)
4(2x+y) -9(x-2y)
4(2x+y) -9(x-2y)
4(2x + y)² - 9(x - 2y)²
= [2(2x + y)]² - [3(x - 2y)]²
= [2(2x + y) + [3(x - 2y)][2(2x + y) - 3(x - 2y)]
=(7x - 4y)(x + 8y)
4(2x+y) -9(x-2y)
=8x +4y -9x +18y
=8x-9x+4y+48y= 22y - x
收起 4(2x+y) -9(x-2y)
=8x +4y -9x +18y
= 22y - x