Răspuns:
Explicație pas cu pas:
7/5×(1 + 3x/7) = x
1 + 3x/7 = x : 7/5
1 + 3x/7 = 5x/7 [ × 7 pentru a elimina numitorul
5 x = 7 + 3 x
5 x - 3 x = 7
2 x = 7 ⇒ x = 7/2
Verific:
7/5 × ( 1 + 3/7 × 7/2) = 7/5 × ( 2/2 + 3/2 ) = 7/5 × 5/2 = 7/2 ( x) √
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5/3 ( 2 - 1x/5) = x
⁵⁾2 - x/5 = x : 5/3
10/5 - x/5 = 3 x/5 [ × 5
3 x = 10 - x
3 x + x = 10
4 x = 10
x =( 10/4)⁽² ⇒ x = 5/2
Verific:
5/3 × ( 2 - 1/5 × 5/2) = 5/3 × ( 4/2 - 1/2) = 5/3 × 3/2 = 5/2 ( x) √
