a.
1/2=x/2x
3/4=3x/4x
2/5=2x/5x
5/6=5x/6x
b.1/2=x+1/2x+2
3/4=3x+3/4x+4
2/5=2x+2/5x+5
5/6=5x+5/6x+6
c.1/2=2x/4x
3/4=6x/8x
2/5=4x/10x
5/6=10x/12x
d.1/2=2x+1/4x+4
3/4=6x+3/8x+4
2/5=4x+2/10x+5
5/6=10x+5/12x+6
3.
a.cu 2 b.cu5 c.cu 8 d.cu10
4.1/5 4/5 5/14 7/12
b.5/2 9/15 34/54 60/91
c.5/16 3/9 7/10 40/19
d. 25/3 4/7 30/17 130/26
