Răspuns :
Răspuns:
=(1·5+4)/5:(3/4·8/21+1)-4/9
=9/5:(2/7+⁷⁾1)-4/9
=9/5:(2/7+7/7)-4/9
=9/5:9/7-4/9
=9/5·7/9-4/9
=⁹⁾7/5-⁵⁾4/9
=63/45-20/45
=43/45
Răspuns:
=(1·5+4)/5:(3/4·8/21+1)-4/9
=9/5:(2/7+⁷⁾1)-4/9
=9/5:(2/7+7/7)-4/9
=9/5:9/7-4/9
=9/5·7/9-4/9
=⁹⁾7/5-⁵⁾4/9
=63/45-20/45
=43/45