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1)Rezolva
(13×c-416:4):7=13


Răspuns :

(13×c-416÷4)÷7=13
(13×c-104)÷7=13
(13×c-104)=7×13
(13×c-104)=91
(13×c)=91+104
13×c=195
c=195÷13
c=15
Verificare: (13×15-416÷4)÷7=13

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(13c-104)x1/7=13

(13c-104)/7=13, se aduce la acelas numitor si vom avea 13c-104=13x7, deci 13c-104=91
13c=91+104
13c=195
c=195/13
c=15