1) 7-84/5= 35/5-84/5=-49/5
2)1/8-3/4=-5/8
3)-49/5*27/9=-1323/45
4)15/-5/8=-24
5)-1323/45--24 миус на минус даёт + 1323/45+24=1403/45
Sinπ(x+7)=-1/2
π(x+7)=-π/2+2πn
x+7=-1/2+2n
x=-7,5+2n,n∈z
(d−2)(11d+1)(4d−11)=(11d²+d-22d-2)(4d-11)=(11d²-21d-2)<span>(4d-11)=44d</span>³-121d²-84d²+231d-8d+22=44d³-205d²+223d+22