Răspuns:
Explicație pas cu pas:
[tex]\bf a) ~~a : 8=12~~~\bigg|\cdot 8[/tex]
[tex]\bf \pink{\underline{a=96}}[/tex]
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[tex]\bf b)~~7\cdot b = 84 ~~\bigg|:7[/tex]
[tex]\bf \purple{\underline{b = 12}}[/tex]
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[tex]\bf c)~~ 90:5:c=6~~~\bigg|\cdot c[/tex]
[tex]\bf 90:5=6\cdot c[/tex]
[tex]\bf 18=6\cdot c~~~\bigg|:6[/tex]
[tex]\bf 3=c[/tex]
[tex]\bf \red{\underline{c=3}}[/tex]
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