Ответы на вопрос:
1). 2-(1 11/30-1.7)*1 2/7: 1 13/14=2-(1 11/30-51/30)*4/27=/30)*4/27=2+22/405=24 405
2). 1/8*(5/9x+8)-0.2*(5/6x+1 2/3)=2
5/72+1-1/6x-1/3=2
5/72-1/6x+1-1/3=2
-7/72x+2/3=2
-7/72x=2-2/3
-7/72x=1 1/3
x=1 1/3: (-7/72)
x=13 5/7
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