a) x=8·9 +8 ·3 -8·4 = 8(9+3-4) =8·8 = 8² = 4³
↓ ↓ ↓
2³·2³ =(2³)²= (2²)³
b) y=17^5 ·16 +17^5 = 17^5 ( 16 +1) = 17^5 ·17 = 17^6 = (17³)² =(17²)³
↓ ↓
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c) z= 64²-50·64 -13 ·64= 64 (64-50-13) = 64 = 8·8 = 8² = 4³
d) t= 25² +25² ·16 +25² ·8 = 25² (1+16+8)= 25²·25 =( 25 )³ = (5²)³=(5³)²= (125)²