Question

2 ,3 ,4 номер помогите

Answer 1

$2.\;\left(\frac6{35}-\frac47\right)-(-1,8-4,3)-5,7=\left(\frac6{35}-\frac{20}{35}\right)-(-6,1)-5,7=\\=\left(-\frac{14}{35}\right)+6,1-5,7=-\frac25+0,4=-0,4+0,4=0\\\\3.\\a)\;5,23+x=-7,24\\x=-7,24-5,23\\x=-12,47\\b)\;y-2\frac5{12}=-3\frac7{15}\\y=2\frac5{12}-3\frac7{15}\\y=2\frac{25}{60}-3\frac{28}{60}\\y=1\frac{85}{60}-3\frac{28}{60}\\y=-1\frac3{60}=-1\frac1{20}\\\\4.\\CD = (-0,8)-(-4,7)=-0,8+4,7=3,9$