Question

Efectuați calculele:

Urgent!
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Answer 1

Răspuns:

a) $\frac{3}{7}$

b) $-\frac{74}{3}$

c) 3

d) $\frac{1}{6}$

e) $\frac{3}{10}$

f) $\frac{7}{12}$

g) $\frac{7}{6}$

h) 3

i) 1,5

Explicație pas cu pas:

a)

$-\frac{2}{7}- (-\frac{5}{7})=\\\frac{-2+5}{7} =\frac{3}{7}$

b)

$-\frac{4}{3}-(+\frac{70}{3} )=\frac{-4-70}{3} =-\frac{74}{3}$

c)

$\frac{9}{4} -(-\frac{3}{4} )=\frac{9+3}{4} =\frac{12}{4} =3$

d)

$\frac{1}{3}-(+\frac{1}{6} )=\frac{1}{3}-\frac{1}{6} = \frac{1}{3} *\frac{2}{2} -\frac{1}{6} =\frac{2-1}{6} =\frac{1}{6}$

e)

$-\frac{2}{5} -(-\frac{7}{10} )=-\frac{2}{5} *\frac{2}{2} +\frac{7}{10} =\frac{-4+7}{10}=\frac{3}{10}$

f)

$\frac{5}{12} =(-\frac{1}{6} )=\frac{5}{12} +\frac{1}{6} *\frac{2}{2} =\frac{5+2}{12} =\frac{7}{12}$

g)

$-\frac{1}{24} -(+\frac{9}{8} )=-\frac{1}{24} -\frac{9}{8} *\frac{3}{3} =\frac{-1-27}{24} =-\frac{28}{24}$ simplificam cu 4 si ne da $\frac{7}{6}$

h) 4,5-(4,5-3)=4,5-1,5=3

i) -7,7-(-2,8)-9=-7,7+2,8-9=10,5-9=1,5

Sper ca te-am ajutat!