Răspuns:
[tex]a)\:\frac{2}{3}\\[/tex]
b) 5733
[tex]c)\:\frac{127}{2}\\[/tex]
Rezolvare:
[tex]x=1\frac{2}{5}+\frac{3}{5}=\frac{7}{5}+\frac{3}{5}=\frac{10}{5}=\bf2\\[/tex]
[tex]y=1\frac{5}{8}\times1\frac{1}{3}=\frac{13}{8}\times\frac{4}{3}=\frac{13}{2}\times\frac{1}{3}=\bf\frac{13}{6}\\[/tex]
[tex]z=[2+(\frac{5}{2}^2)]:3\frac{1}{7}\times8=(2+\frac{25}{4}):\frac{22}{7}\times8=\frac{33}{4}\times\frac{7}{22}\times8=3\times\frac{7}{2}\times2=\bf21\\[/tex]
a) [tex]x+y-\frac{z}{6}=2+\frac{13}{6}-\frac{21}{6}=2+\frac{-8}{6}=2-\frac{4}{3}=\frac{6-4}{3}=\bf\frac{2}{3}\\[/tex]
b) [tex]3\times x\times y+z^2=3\times2\times\frac{13}{6}\times21^2=2\times\frac{13}{2}\times441=13\times441=\bf5733\\[/tex]
c)[tex]xyz-xy-yz=2\times\frac{13}{6}\times21-2\times\frac{13}{6}-\frac{13}{6}-21=\frac{13}{3}\times21-\frac{13}{3}-\frac{13}{6}-21=91-\frac{13}{3}-\frac{13}{6}-21=70-\frac{13}{2}=\bf\frac{127}{2}\\[/tex]
Succes! ❀
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