Ответы на вопрос:
1) 4^x - 81* 4^x = - 5^(x+3) + 5^(x+2); 4^x*(1-81) = 5^(x+2) - 5^(x+3) ; - 80 * 4^x = 5^x* 5^2 - 5^x * 125; - 80*4^x = 5^x(25 - 125) ; - 80* 4^x = - 5^x *100; 4^x *80 = 5^x *100; 4^x / 5^x = 100/80; (4/5)^x = 5/4; (4/5)^x = (4/5)^(-1); x = -1. 2) 3^x * 5^(2x) = 7; 3^x * 25^x = 7; (3*25)^x = 7; 75^x = 7; x = log75_7
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