x分之(1)+2x分之(1)-4x分之(1)x+5分之2-1-x分之1( x-3 )²分之x²-y-(3-x)²分之9-y

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x分之(1)+2x分之(1)-4x分之(1)x+5分之2-1-x分之1(x-3)²分之x²-y-(3-x)²分之9-yx分之(1)+2x分之(1)-4x分之(1)x+5分

x分之(1)+2x分之(1)-4x分之(1)x+5分之2-1-x分之1( x-3 )²分之x²-y-(3-x)²分之9-y
x分之(1)+2x分之(1)-4x分之(1)
x+5分之2-1-x分之1
( x-3 )²分之x²-y-(3-x)²分之9-y

x分之(1)+2x分之(1)-4x分之(1)x+5分之2-1-x分之1( x-3 )²分之x²-y-(3-x)²分之9-y
x分之(1)+2x分之(1)-4x分之(1)
=4/(4x)+2/(4x)-1/(4x)
=5/(4x)
(x+5)分之2-(1-x)分之1
=(x+5)(x-1)分之2(x-1)+(x-1)(x+5)分之(x+5)
=(x+5)(x-1)分之[2(x-1)+(x+5)]
=(x+5)(x-1)分之(3x+3)
( x-3 )²分之(x²-y)-(3-x)²分之(9-y)
=( x-3 )²分之(x²-y)-(x-3)²分之(9-y)
=( x-3 )²分之[(x²-y)-(9-y)]
=( x-3 )²分之(x²-9)
=(x-3)分之(x+3)