3x-2/5=2x-3/4. 12x-8=10x-15; 12x-10x= -15+8; 2x= -7; x= (-7)/2= -3,5. Ответ: x= -3,5.
<span>log6 (8–x)=log<span>62</span> 9
log6 (8–x)=(1/2)log6 9
log6 (8–x)=(1/2)log6 32
log6 (8–x)=log6 3
8–x=3
x=55</span><span>ОТВЕТ:<span>5</span></span>
А(а+2в)-(в+а)²=а²+2ав-(в²+2ав+а²)=а²+2ав-в²-2ав-а²= - в²