[tex]a=\frac{1}{7}+\frac{1}{7}:\frac{1}{2}\\\\ a= \frac{1}{7}+\frac{1}{7}\cdot 2\\\\a=\frac{1}{7}+\frac{2}{7}\\\\a=\frac{3}{7}[/tex]
[tex]b=(0,75+0,5):6,25\\\\b=1,25:6,25\\\\b=0,2\\\\b=\frac{1}{5}[/tex]
[tex]c=\frac{1}{2}:\frac{4}{3}+\frac{1}{4}\cdot \frac{1}{2} \\\\ c=\frac{3}{8}+\frac{1}{8} \\\\ c=\frac{4}{8} \\\\ c=\frac{1}{2}[/tex]
[tex]d=7a-5b+2c\\\\d=3-1+1\\\\d=3[/tex]
Mai multe despre calculul fractiilor gasesti aici: https://brainly.ro/tema/1048628
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