Question

ПОМОГИИИТЕ ПОЖАЛУЙСТААА​

Answer 1

$1.\;2\frac12\cdot\left(\frac2{15}-3\frac56\right)-2\frac34=\frac52\cdot\left(\frac2{15}-\frac{23}6\right)-\frac{11}4=\frac52\cdot\frac{2\cdot2-23\cdot5}{30}-\frac{11}4=\\\\=\frac52\cdot\left(-\frac{111}{30}\right)-\frac{11}4=-\frac{37}4-\frac{11}4=-\frac{48}4=-12$

$2.\;-1\frac17\cdot\left(\frac45+\frac{19}{20}\right)\cdot\left(6\frac56+4\frac23\right)=-\frac87\cdot\frac{16+19}{20}\cdot\left(\frac{41}6+\frac{14}3\right)=-\frac87\cdot\frac{35}{20}\cdot\frac{41+28}6=\\\\=-2\cdot\frac55\cdot\frac{69}6=-\frac{69}3=-23$

$3.\;\left(6\frac38-2\frac34\right)\cdot(-4)+\frac7{18}\cdot9=\left(\frac{51}8-\frac{11}4\right)\cdot(-4)+\frac72=\frac{51-22}8\cdot(-4)+\frac72=\\\\=-\frac{29}2+\frac72=-\frac{22}2=-11$

$4.\;9\frac16:\left(4\frac13-8\right)+24\cdot\frac38=\frac{55}6:\left(-3\frac23\right)+3\cdot3=-\frac{55}6:\frac{11}3+9=-\frac{55}6\cdot\frac3{11}+9=\\\\=-\frac52+9=-2,5+9=6,5$