①(3x-5)²-(2x+7)² ②(x+y+1)(x+y-1) ③(2x-y-3
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①(3x-5)²-(2x+7)² ②(x+y+1)(x+y-1) ③(2x-y-3
①(3x-5)²-(2x+7)² ②(x+y+1)(x+y-1)
③(2x-y-3)²
④((x+2)(x-2))
①(3x-5)²-(2x+7)² ②(x+y+1)(x+y-1)
③(2x-y-3)²
④((x+2)(x-2))
①(3x-5)²-(2x+7)²=(5x+2)(x-12)=5x²+2x-60x -24=5x²-58x-24
②(x+y+1)(x+y-1)=(x+y)²-1=x²+y²+2xy-1
③(2x-y-3)²=4x²-2x(y+3)+(y+3)²=4x²-2xy-6x+y²+6y+9
④((x+2)(x-2))²=(x²-4)²=x^4-8x²+16
②(x+y+1)(x+y-1)=(x+y)²-1=x²+y²+2xy-1
③(2x-y-3)²=4x²-2x(y+3)+(y+3)²=4x²-2xy-6x+y²+6y+9
④((x+2)(x-2))²=(x²-4)²=x^4-8x²+16
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
①(3x-5)²-(2x+7)² ②(x+y+1)(x+y-1) ③(2x-y-3
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