仅仅是个因式分解,求解答因式分解:16(x+y)² - 25(x-y)² 速度啊
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仅仅是个因式分解,求解答因式分解:16(x+y)² - 25(x-y)² 速度啊
仅仅是个因式分解,求解答
因式分解:16(x+y)² - 25(x-y)² 速度啊
仅仅是个因式分解,求解答因式分解:16(x+y)² - 25(x-y)² 速度啊
16(x+y)² - 25(x-y)²
=[4(X+Y)]²-[5(x-y)]²
=[4(x+y)+5(x-y)][4(x+y)-5(x-y)]
=(4x+4y+5x-5y)(4x+4y-5x+5y)
=(9x-y)(9y-x)
=[4(x+y)]²-[5(x-y)]²
=(4x+4y+5x-5y)(4x+4y-5x+5y)
=(9x-y)(9y-x)
=(4x+4y)²-(5x+5y)²
=(9x+9y)(-x-y)
=-9(x+y)²
=-9x²-18xy-9y²
=[4(x y)]平方-[5(x-y)]平方
平方差公式
=[4(x y) 5(x-y)][4(x y)-5(x-y)]
去括号,并合并同类项
=(9x-y)(9y-x)