-1,8 - 1 3/8= ( сколько будет)

-1,8 - 1 3/8= -1 4/5-1 3/8=-9/5-11/8= -72/40-55/40=-127/40=-3 7/40

[latex]-1,8-1 \frac{3}{8} =(-1 \frac{8}{10}) -1 \frac{3}{8}=(- \frac{18}{10}) - \frac{11}{8}=(- \frac{18*4}{10*4}) - \frac{11*5}{8*5}= \\ \\ \\ =(- \frac{72}{40}) - \frac{55}{40}=( -\frac{127}{40} )=(-3 \frac{7}{40} )=(-3,175)[/latex]