<span>10 2/3* 0,6+7:2,5-68:1,5</span>
1) 10 2/3*0,6 =10,7*0,6=6,4
2)7/2,5=2,8
3)68/1,5=45,3
4) 6,4+2,8-45,3=-36,1
<span>5/7(5,6-2,1y)= 2.4(5/8-2/3y)</span>
<span>4-1,5y=1.5-8/5y</span>
<span>8/5y-1.5y=1.5-4</span>
<span>0.1y=-2.5</span>
<span>y=-25</span>
<span><span>m: 25/6=4/7:20/21</span></span>
<span><span>m:25/6=4/7:20/21</span></span>
<span><span>m:25/6=3/5</span></span>
<span><span>m=3/5*25/6</span></span>
<span><span>m=2.5</span></span>