a) [tex] \frac{2}{5}- \frac{1}{3} = \frac{6}{15}- \frac{5}{15} = \frac{1}{15} [/tex]
b) [tex] (-2)^{2} * 2^{6} : (-4)^{4}+ 2^{-1} = 2^{2}* 2^{6} : (- 2^{2} )^{4} + 2^{-1} = 2^{2}* 2^{6} : 2^{8} + 2^{-1} = [/tex][tex] 2^{8}: 2^{8}+ 2^{-1}= 2^{0} + 2^{-1}= 1+\frac{1}{2} = \frac{2}{2} + \frac{1}{2}= \frac{3}{2} [/tex]
c)[tex] \frac{4}{5}+X=1 [/tex]
[tex] \frac{4}{5}+ \frac{5X}{5}= \frac{5}{5} /5[/tex]
[tex]4+5X=5[/tex]
[tex]5X=5-4[/tex]
[tex]5X=1[/tex]
[tex]X= \frac{1}{5} [/tex]
