∵2分之x=3分之y
∴y=2分之3x
∵2分之x=4分之z
∴z=2分之x
(x+y-z)分之(x+y+z)
=(x+y-z)分之[(x+y-z)+2z]
=1+(x+y-z)分之2z
=1+(x+2分之3x+2分之x)分之x
=1+(3x)分之x
=1+3分之1
=1又3分之1
∵2分之x=3分之y
∴y=2分之3x
∵2分之x=4分之z
∴z=2分之x
(x+y-z)分之(x+y+z)
=(x+y-z)分之[(x+y-z)+2z]
=1+(x+y-z)分之2z
=1+(x+2分之3x+2分之x)分之x
=1+(3x)分之x
=1+3分之1
=1又3分之1