<span>1) 2 1/3: 2 2/3*1 3/5=7/8*1 3/5=1 2/5
</span>2 1/3: 2 2/3=7/3:8/3=7/3*3/8=7/8
7/8*1 3/5=7/8*8.5=7/5=1 2/5
2)2 1/4* 12/13:3 3/8=2 1/13:3 3/8=8/13
2 1/4* 12/13=9/4*12/13=9/1*3/13=27/13=2 1/13
2 1/13:3 3/8=27/13:27/8=27/13*8/27=8/13
<span>3) 3 2/3:7 1/3* 2/5=1/2*2/5=1/5
</span>
3 2/3:7 1/3=11/3:22/3=11/3*3/22=1/2
1/2*2/5=1/5
<span>4) 1 1/9 * 2 1/5: 7 1/3=2 4/9:7 1/3=1/3
</span>
1 1/9 * 2 1/5=10/9*11/5=22/9=2 4/9
<span>2 4/9:7 1/3=22/9:22/3=22/9*3/22=1/3</span>
(2+2+2+2+2):2 = 5
ну и всё
<em>(8*8+8):8=9 (8*8-8):8=7</em>
14км во второй, 10км в первый.
<span>S=S1+S2. S1=5/7 * S2. </span>
<span>S1+S2= 5/7 S2 + 7/7 S2 = 12/7 S2 </span>
<span>24 = 12/7 S2. </span>
<span>S2= 14 </span>
<span>S1 = 10</span>
2 см^3 – 15,6 г
3,5 см^3 – Х г
Х = (3,5 * 15,6) / 2 = 27,3 г