Ответы и объяснения

2014-03-11T11:41:30+04:00
а)4 2/7*56/135*22 10/11*3/8*25/28=13 7/11
1)4 2/7*56/135=30/7*56/135=80/45
2)80/45*22 10/11=80/45*252/11=40 8/11
3)448/11*3/8=15 3/11
4)168/11*25/28=13 7/11
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б)8/45*1 1/4-11/75*2 8/11=-8/45
1)8/45*1 1/4=8/45*5/4=2/9
2)11/75*2 8/11=11/75*30/11=30/75=2/5
3)2/9-2/5=10/45-18/45=-8/45