ali hoahoc 9x

hi cac ban
minh muon hoi cac ban vai bai
chung minh cung share nhe!!!
/chung minh phuong trinh
x^{7} - x^{2} -2x-1=0
co 1 nghiem duy nhat!!

2/tim min , max cua ham

a/f(x)=2 x^{5} + 3 :sqrt{1- x^{2} }

b/f(x)= 5 x^{5} +3 :sqrt{1- x^{2} }
3 / tim max cua ham
f(x)=2x+ :sqrt{x} + :sqrt[4]{1-x} + :sqrt[6]{1-2x}

hi moi nguoi
minh vua vao hox lop 10 chuyen tong hop .minh rat can co nhieu sach chuyen toan
ban nao biet chi giup minh nhe minh dang rat can!!
thank you very much!!

hi moi nguoi

minh muon hoi cac ban 3 bai
1/tim min, max ham f(x)= 5x^{2} + 3 :sqrt{1- x^{2} }

2/chung minh phuong trinh x^{7} - x^{2} -2x -1=0 co duy nhat 1 nghiem

3/ tim max cua ham f(x)= x+ :sqrt{x} + :sqrt[4]{1-x} + :sqrt[6]{1-2x}



cac ban giup minh nhe!!!!!!!!!