Question

calculează:
a) -3/4-5/6=
b) -8/9+7/12=
c) -3/7×14/27=
d) -6:(-6/7)=
e) (-1/3)²=
f) (-3/4)³=​

Answer 1

Răspuns:

a)-19/12

b)-11/36

c)-2/9

d)7

e)1/9

f) -27/64

${( - \frac{3}{4} }^{3} ) = - \frac{27}{64}$

$- 6 \div ( - \frac{6}{7} ) = - \frac{6}{1} \times ( - \frac{7}{6} ) = + 7$

${( - \frac{1}{3} ) }^{2} = + \frac{1}{9}$

$- \frac{3}{7} \times \frac{14}{27} = - \frac{2}{9}$

Explicație pas cu pas:

$- \frac{3}{4} - \frac{5}{6} = - \frac{3 \times 3}{4 \times 3} - \frac{5 \times 2}{6 \times 2} = - \frac{9}{12} - \frac{10}{12} = - \frac{19}{12}$

$- \frac{8}{9} + \frac{7}{12} = - \frac{8 \times 4}{9 \times 4} + \frac{7 \times 3}{12 \times 3} = - \frac{32}{36} + \frac{21}{36} = - \frac{11}{36}$