Решите пожалуйста .дается 24 балла

Решите задачу:

$a)\;1)\;\frac34\cdot1,8\cdot1\frac15:0,07=\frac34\cdot1\frac45\cdot\frac65:\frac7{100}=\frac34\cdot\frac95\cdot\frac65\cdot\frac{100}7=\frac{162}7\\2)\;\frac15:0,49\cdot2\frac58=\frac15:\frac{49}{100}\cdot\frac{21}8=\frac15\cdot\frac{100}{49}\cdot\frac{21}8=\frac{15}{14}\\3)\frac{162}7:\frac{15}{14}=\frac{162}7\cdot\frac{14}{15}=\frac{108}5=21\frac35=21,6\\\\b)\;1)\;0,2\cdot6,2:0,31-\frac56\cdot0,3=0,2\cdot20-\frac56\cdot\frac3{10}=4-\frac14=3\frac34=\frac{15}4$
$2)\;2+1\frac4{11}\cdot0,22:0,01=2+\frac{15}{11}\cdot\frac{11}{50}:\frac1{100}=2+\frac{15}{50}\cdot100=2+30=32\\3)\;\frac{15}4:32=\frac{15}4\cdot\frac1{32}=\frac{15}{128}\\\\c)\;1)\;12,75\cdot\frac4{25}\cdot1,8=12\frac34\cdot\frac4{25}\cdot\frac95=\frac{51}4\cdot\frac4{25}\cdot\frac95=\frac{459}{125}\\2)\;1\frac12\cdot2,04:20=\frac32\cdot\frac{51}{25}\cdot\frac1{20}=\frac{153}{1000}\\3)\;\frac{459}{125}:\frac{153}{1000}=\frac{459}{125}\cdot\frac{1000}{153}=24$

$d)\;1)\;\left(1,75\cdot\frac25+1,75:1\right)\cdot1\frac57=1,75\cdot1\frac25\cdot1\frac57=\frac74\cdot\frac75\cdot\frac{12}7=\frac{21}5\\2)\;\left(\frac{17}{40}-0,325\right):\frac15\cdot0,4=\left(\frac{17}{40}-\frac{13}{40}\right)\cdot5\cdot\frac25=\frac4{40}\cdot2=\frac15\\3)\;\frac{21}5:\frac15=\frac{21}5\cdot5=21$