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

Question

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

Answer 1

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)