nyatakan persamaan diatas dengan x

Bab Aljabar Dasar
Matematika SMP Kelas VII

11] S = bx - bc + cx
bx + cx = S + bc
x (b + c) = S + bc
x = (S + bc)/(b + c)

12] S = 2 (ab + ax + bx)
ax + bx + ab = S/2
x (a + b) = (S/2) - ab
x = (S - 2ab)/2 . 1/(a + b)
x = (S - 2ab)/(2a + 2b)

11) S = bx - bc +cx
bx + cx = S + bc
x(b + c) = S + bc
[tex]x= \frac{S+bc}{b+c} [/tex]

12) S = 2(ab + ax + bx)
S = 2ab + 2ax + 2bx
2ax + 2bx = S - 2ab
x(2a + 2b) = S - 2ab
[tex]x= \frac{S-2ab}{2a+2b} [/tex]
[tex]x= \frac{S-2ab}{2(a+b)} [/tex]