(60-10÷5×10):(80-7×9+9:3)=

Răspuns :

(60-10÷5×10):(80-7×9+9:3)=
=(60-2×10):(80-63+3)
=(60-20):(17+3)
=40:20
=2
(60-20)*(80 -63+3)=40*40=1            
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