Question

1/1/2-3/10+1/5 please help me

Answer 1

$\dfrac{1}{\frac{1}{2}}-\dfrac{3}{10}+\dfrac{1}{5}=1\cdot\dfrac{2}{1}-\dfrac{3}{10}+\dfrac{1\cdot2}{5\cdot2}=2-\dfrac{3}{10}+\dfrac{2}{10}=2-0.3+0.2=1.9$

Answer 2

If plus or minus the bottom of line must be the same number

but if devide or multiplication the bottom of line no need to be same number