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(1-19/20)x(-5)+13/4 2/7-(1-5/7)x(13/2-3/4)

Răspuns :

1/20x-5+26/28-2/7x23/2=
=-5/20+26/28-26/14
=-35/240+130/240-260/140
=-164/240=-82/120=-41/60
=-41/60