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(1 - 19 supra 20 ) • ( -5) + 13 supra 4 = ???????

Răspuns :

1-19/20 = 20-19 / 20 = 1/20 * (-5) = -5/20 +13/4=-5+  65 / 4 = -60/4 = -15
(20-19)/20*(-5)+13/4=1/20*(-5)+13/4=-1/4+13/4=(13-1)/4=12/4=3