<span>a)13/15 -2/15=11/15
11/12 - 5/12=6/12
б)</span><span>3/4 - 1/8=6/8-1/8=5/8
8/21 - 3/7=</span> 8/21 - 9/21= -1/21
а)<span>1/3 - 1/18 + 1/6=8/18
б)</span><span>7/12 + x = 5/6
х=5/6-7/12
х=3/12</span>
444 = 4*111 = 2*2*3*37
888 = 2*2*2*2*3*37
999 = 3*3*3*3*37
2220 = 10*222 = 2*2*3*5*37
1. 378
2. 340
3. 294
4. 651
5. 272
6. <span>445</span>
26/65 = 0,4 (км) - 1 процент всего пути
<span>0,4*100 = 40 (км) - 100 процентов пути</span>