Question

Scrieti cate doua ecuatii echivalente cu fiecare dintre ecuatiile:
-x+2=3
3x-7=2
4x-2=12-3x
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Answer 1

Răspuns:

-x + 2 = 3 ⇔ -x = 3 -2 ⇔ -x = 1 ⇔ x = -1

x -2 = -3 ⇔ x = -3 + 2 ⇔ x = -1

3x-7=2⇔ 3x=2+7 ⇔ 3x=9 ⇔ x=9 : 3 ⇔ x=3

4x-2 =12-3x ⇔ 4x+3x=12+2 ⇔ 7x = 14 ⇔ x = 14 : 7 ⇔ x=2