Question

calculati (-3/10+4/15)•2 1/2=....aiutor​

Answer 1

$(-\frac{3}{10} +\frac{4}{15} )*2\frac{1}{2} \\\\=(-\frac{3}{10} +\frac{4}{15} )*\frac{5}{2}\\\\ =-\frac{3}{10}*\frac{5}{2} +\frac{4}{15}*\frac{5}{2}\\\\=-\frac{3}{4}+\frac{4}{6}\\\\ =\frac{-9+8}{12}\\\\ =\frac{-1}{12}$

Answer 2

Răspuns:

2 si 1/2=(2·2+1)/2=5/2

(-³⁾3/10+²⁾4/15)·5/2=

(-9/30+8/30)·5/2=

-1/30·5/2= -5/60= -1/12