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Maringeorgeta
a fost răspuns

Efectuati prin metoda mersului invers:
(7×a)-35× 12=378



Si asta
(945:a)+63×20=1269

Dau coronita

Răspuns :

KittyWoman50
(7xa ) - 35 x 12 = 378 
7a - 420 = 378
7a = 420+378
7a = 798
798:7 = 114 .
a=114 .

(945 : a ) + 63 x 20 = 1269
945:a + 1260 = 1269
945:a = 1269-1260
945:a = 9
a= 945:9
a= 105
GiorgianaAlexandra
(((378/12)+35)/7)=a
a=9,5
(((1269/20)-63)*945=a
a=425,25

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