[tex] {10}^{40} \div (5 \times 2) {}^{30} = [/tex]
[tex] \frac{10 {}^{40} }{(5 \times 2) { }^{30} } = [/tex]
[tex] \frac{2 {}^{40} \times 5 {}^{40} }{5 { } ^{30} \times 2 {}^{30} } = [/tex]
[tex]2 {}^{10} \times 5 {}^{10} = [/tex]
[tex](2 \times 5) {}^{10} = [/tex]
[tex]10 {}^{10} [/tex]
