1 <span>7/9</span>*2 <span>2/5</span>= <span>1*9 + 7/9 *</span><span>2*5 + 2/5 </span>=<span>16/9*</span><span>12/5</span>=<span>16 *12/9 *5</span>= <span>192/45</span>=<span>64*3/15*3= </span>=<span>64/15</span>=4 <span>4/15
4 4/15 : 1 3/5 = 64/15:8/5= 64/15*5/8= 64 *5/15 *8=320/120 =8*40/3*40=8/3 =2 2/3</span><span>
</span>
Ответ:
.................................,. ....
2400+4800=7200 стоит 24м сукна
7200/24=300 стоит 1м сукна
2400/300=8 м в первом куске
4800/300=16 м во втором куске
2-3 1/7•(2-1 9/11 ):8/21= 2-3 1/7•2/11:8/21= 2-4/7:8/21=2-1 1/2= 1/2 =0.5