dau coroana
e urgent

a) (5-5)×5+5÷5=1
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b) 5+5-5+5-5=5
sau
(5+5-5):(5:5)=5
sau
5×5×5÷5÷5=5
sau
(5÷5)×(5+5-5)=5
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c)5×5-5-5-5=10
sau
5×5-(5+5)-5=10