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In ograda unui gospodar sunt gaini si oi. in total sunt 69 de capete si 180 de picioare. Cate gaini si oi are gospodarul?


Răspuns :

x- gaini y= oi x+y=68 /-2 2x+4y=180 -2x-2y=-136 2x+4y=180 -----------------(+) / 2y=44 y=44:2 y=22 oi x+22=68 x=68-22 x=46 gaini
a = gaini , b = oi , a + b = 68 /-2 , 2a + 4b = 180 , -2a - 2b = -136 , 2a + 4b = 180 , 2b = 44 , b =44 ÷ 2 , b =22 ( oi ) , a +22=68 , a =68-22 , a =46 ( găini ) .