<span>1,4/x = 4,2/8,12</span>
<span />4,2х=1,4*8,12
х=8,12/3
2 1/4:1,25=y:4,5
<span><span>9/4/1,25=y/4,5 </span></span>
<span><span>y=(9,4*4,5)/1,25</span></span>
<span><span>y= 42,3/1,25</span></span>
<span><span>y=33,84</span></span>