bantu dong perlu.........

(21+14)²-18²
35²-18²
(35 x 35) - (18 x 18)
1225 - 324
901

Yg B jawabannya.

Hopefully this is the best for you, stay focus and be the best, Buddy :)

Km = (21+14)kubik-18 kubik
35kubik - 324 = 1225-324 = 901