Jika x = 7 y = 8 z = 9 a = 7x b = 9y c = 10z Maka, a × b + c = ? a. 3816 b. 3618 c. 3168 d. 1683

Jawaban:
a=7x
b=9y
c=10z
x=7
y=8
z=9
a=7x=7(7)=7 × 7=49.
b=9y=9(8)=9 × 8=72.
c=10z=10(9)=10 × 9=90.
a × b + c=7x × 9y + 10z.
=(49 × 72) + 90.
=3.528 + 90.
=3.618 (B).