Question

пожалуйста, помогите решить, даю 35 баллов​

Answer 1

Ответ:

$\displaystyle 5\cdot \Big(\frac{1}{5}\Big)^2-16\cdot \frac{1}{5}=5\cdot \frac{1}{25}-\frac{16}{5}=\frac{1}{5}-\frac{16}{5}=\frac{-15}{5}=-3\\\\\\\frac{2,1\cdot 3,5}{4,9}=\frac{21\cdot 35}{490}=\frac{(3\cdot 7)\cdot (5\cdot 7)}{7\cdot 7\cdot 5\cdot 2}=\frac{3}{2}=1,5\\\\\\4,6\cdot 3,9+1,74=4,6\cdot (4-0,1)+1,74=18,4-0,46+1,74=19,68$

$\displaystyle \Big(\frac{17}{10}+\frac{10}{11}\Big):\frac{5}{44}=\frac{17\cdot 11+10\cdot 10}{10\cdot 11}\cdot \frac{44}{5}=\frac{287}{110}\cdot \frac{44}{5}=\frac{287\cdot 22}{55\cdot 5}=\dfrac{287\cdot 2}{5\cdot 5}=22,96\\\\\\400\cdot 0,004\cdot 40=(4\cdot 100)\cdot (4:1000)\cdot (4\cdot 10)=\frac{4\cdot 4\cdot 4\cdot 1000}{1000}=4\cdot 4\cdot 4=64$

Answer 2

$1)5 \times ( \frac{1}{5}) ^{2} - 16 \times \frac{1}{5} = 5 \times ( \frac{1}{5} \times \frac{1}{5} ) - \frac{16}{1} \times \frac{1}{5} = 5 \times ( \frac{1 \times 1}{5 \times 5} ) - \frac{16 \times 1}{1 \times 5} = 5 \times \frac{1}{25} - \frac{16}{5} = \frac{5}{1} \times \frac{1}{25} - 3 \frac{1}{5} = \frac{5 \times 1}{1 \times 25} - 3 \frac{1}{5} = \frac{1}{5} - 3 \frac{1}{5} = - 3$

$2) \frac{2.1 \times 3.5}{4.9} = \frac{7.35}{4.9} = 1 \frac{2.45}{4.9} = 1 \frac{1}{2}$

$3)4.6 \times 3.9 + 1.74 = 17.94 + 1.74 = 19.68$

$4)( \frac{17}{10} + \frac{10}{11} ) \div \frac{5}{44} = ( \frac{187}{110} + \frac{100}{1 10} ) \div \frac{5}{44} = ( \frac{187 + 100}{110} ) \div \frac{5}{44} = \frac{287}{110} \div \frac{5}{44} = \frac{287}{110} \times \frac{44}{5} = \frac{287 \times 44}{110 \times 5} = \frac{574}{25} = 22 \frac{24}{25}$

$5)400 \times 0.004 \times 40 =400 \times 40 \times 0.004 = 16000 \times 0.004 = 64$