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10x{247+2x(205x100-20000)}=

Răspuns :

10x[247+2x(20500-20000)]
10x(247+2x500)
10x(247+1000)
10x1247
12470
=10*[247+2*(20500-20000)]
=10*(247+2*500)
=10*(247+10000
=10*10247
=102470