1/(х-3)(х+3)+2-х/х-3= х(х+3)/(х-3)(х+3)=х^+3х/(х-3)(х+3)=х(х+3)/(х-3)(х+3)=х/х-3
А) 3∛64 +3∛-125 = 3·4 -3·5 = -3
б) 3√27х -3√216х = 9√3х -18√6х
в)-3·3√2 /3 √54 = -9√2 / 9√6 = -1/√3 = -√3/3
(3✓2+6✓2-2✓3)(3✓2+6✓2+2✓3)=(9✓2-2✓3)(9✓2+2✓3)=162-12=150
22cos²x+4sin2x-7cos²x-7sin²x=0
7sin²x-8sinxcosx-15cos²x=0 /cos²x≠0
7tg²x-8tgx-15=0
tgx=a
7a²-8a-15=0
D=64+420=484 √S=22
a1=(8-22)/14=-1⇒tgx=-1⇒x=-π/4+πn
a2=(8+22)/14=15/7⇒tgx=15/7⇒x=arctg15/7+πn