Question

Tentukan nilai pengganti huruf-huruf berikut sehingga persamaannya menjadi benar.
a. 5 x ( -12 ) = a x 5
b. -5 x ( -b ) x 2 = 2 x 6 x ( -5 )
c. ( c ) x ( -26 ) = 26
d. ( 6 x d ) x ( -15 ) = 6 x ( 5 x ( -15))

Answer 1

A. 5 x (-12) = a x 5
-60 = a x 5
-60 : 5 = a
-12 = a

b. (-5) x (-b) x 2 = 2 x 6 x (-5)
10b = -60
b = -6

c. (c) x (-26) = 26
-26c = 26
c = -1

d. (6 x d) x (-15) = 6 x (5 x (-15))
6d x (-15) = 30 x (-90)
-90d = -2700
d = 30