簡化公式一問

1. (X / 3X+3) + (5X / 4X+4)
= X / 3 (X+1) + 5X / 4(X+1)
= 4X / 12 (X+1) + 15X / 12 (X+1)
=19 / 12 (X+1)

2. (2X-5/X-3) - (2/2X-6)
= 2X-5 / X-3 - 2 / 2 (X-3)
= 2(2X-5) / 2(X-3) - 2 / 2 (X-3)
= 4X -10 -2 / 2 (X-3)
= 4X-8 / 2 (X-3)
= 4( X-2) / 2 (X-3)
= 2(X-2) / (X-3)

3.(1)+(5X/X+4)
= X+4 / X+4 + 5X / X+4
= X+4+5X / X+4
=6X+4 / X+4
=2(3X+2) / X+4

4.(X)-(XY/X+Y)
=X(X+Y) / X+Y - XY / X+Y
=X2+XY-XY /X+Y
=X2 / X+Y

5.(1/m-1)-(3/m)
=m / m(m-1) - 3(m-1) / m(m-1)
=m-3(m-1) / m(m-1)
=m-3m+3 / m(m-1)
=3-2m / m(m-1)

X2 mean X square