Решите логарифмические уравнения: 1) Log2 (9-x)=2*log2 (3)2) log7(x+5)=log7(4x-7). Created by az34358strelok8390. algebra-ru

Решите логарифмические уравнения: 1) Log2 (9-x)=2*log2 (3)2) log7(x+5)=log7(4x-7...

Verified answer

$1)\; \; log_2(9-x)=2\cdot log_23\; \; ,\quad ODZ:\; 9-x>0\; ,\; \; x$

$2)\; \; log_7(x+5)=log_7(4x-7)\; \; ,\quad ODZ:\; \left \{ {{x+5>0} \atop {4x-7>0}} \right.\; \left \{ {{x>-5} \atop {x>1,75}} \right.\; \; \to \; x>1,75\\\\x+5=4x-7\\\\3x=12\\\\\boxed {x=4}$

Answers & Comments

Verified answer

41be4c36582efc5a98899ff9a4871cfa

(c+2)!...

1iz predlozhenij 1518 vypishite slovo v kotorom pravopisanie suffiksa opredelyae

sredi predlozhenij 815 najdite predlozhenie s obosoblennym rasprostranyonnym oprede3cb8f3de2b3a23947ecdc6882efb092 68485

reshite neravenstva 1 054x 7gt1 27x2 147xlt5 3 405x2 3gt

rasstavte koefficienty v sleduyushih himicheskih uravneniyah 1 znhclzncl2h2 2

3)^3)*(c^-1,5)...

nado sostavit predlozhenie s odnorodnymi chlenami

iz predlozhenij 1619 vypishite slovo v kotorom pravopisanie suffiksa opredelyaetsfba426a61738cb6e408bc8c61cbc8152 30573

nauchite pzh sokrashat drobi na podobie etoj

рекомендуемые вопросы

Helpful Links

Helpful Social