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2+2×{100+a×[100-40]}=682

Răspuns :

2+2•(100+a•60)=682
2+200+120a=682
202+120a=682
120a=682-202
120a=480
a=4
2+2 X( 100 +a x 60 ) = 682
2+2 x  (100+ 60a )= 682
2+ 200 +120 a = 682
120 a = 480
a= 4