1) П-2*П/2=0
2) arcsin(-√3/2)+arctg(√3)=-П/3+П/3=0
3)arccos(sin(-п/4))=arccos(-√2/2)=3П/4
4)-П/2+2*0=-П/2
5)2П/3-2П/3=0
6)arccos(tg(-П/4))=arccos(-1)=П
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3/4 - 1/6 = 7/12
7/12 * 3 = 7/4 а это равно 1,75
(n^-4÷4m^-5)*6n^6m^2=(n^-4/4*m^-5)*6n^6m^2=m^-5n^-4/4*6n^6m^2=1/2m^5n^4*3n^6m^2=1/2m^3*3n^2=3n^2/2m^3
ответ: 3n^2
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2m^3
4 (х-6)=5
4х-24=5
4х=5+24
4х=29
х=29÷4
х=7,25