(5-1 DIVIDE 70 ) multiply 53

5-1 ÷ 70 × 53=15 ÷ 1 × 5×5×5 as, a-m = 1am and a0 = 1=15 × 5×5×5 = 5×5= 25

(5^-1DIVIDE 7⁰) multiply 5³

[5^{- 1} \div 7^{0}] \times 5^{3} = [\frac{1}{5} \div 1] \times (5 \times 5 \times 5) [as, a^{- m} = \frac{1}{a^{m}} and a^{0} = 1] = \frac{1}{5} \times (5 \times 5 \times 5) = 5 \times 5 = 25