Question

b)[2¹²×2¹⁸+5⁷⁰:5¹⁰-(3²⁵)²]:[4²×2³×2²³+(5¹⁵)²-(3²)⁵]​

Answer 1

$[2^{12}\cdot 2^{18}+5^{70}:5^{10}-(3^{25})^2]:[4^2\cdot 2^3\cdot 2^{23}+(5^{15})^{2^2}-(3^2)^{5^2}]=\\=(2^{30}+5^{60}-3^{50}):(2^{30}+5^{60}-3^{50})=\boxed{\bold{1}}$

Answer 2

$\it (5^{15})^{2^2}-(3^2)^{5^2}= 5^{60}-3^{50}$