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

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Răspuns :

[tex][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}}[/tex]

[tex]\it (5^{15})^{2^2}-(3^2)^{5^2}= 5^{60}-3^{50}[/tex]