1)giai phuong trinh:
a) x^4=4x+1
b) x^2+4x^2/(x+2)^2=12
c)(3x-5/8)-(x+1/6)=x/4
2)mot ro cam co tat ca 96 qua .neu chuyen 4 qua tu ro thu nhat sang ro thu 2 thi so cam trong ro thu nhat bang 3/5 so cam trong ro thu hai.hoi luc dau moi ro co bao nhieu qua cam.
mot vat hinh tru khong tham chat long,cao 24 cm,day co dien tich 50 cm2,khoi luong rieng D=0,6g/cm3
a)dat vat thang dung len mat ban nam ngang.tinh ap suat do vat gay ra len mat ban
b)nhan chim hoan toan vat do vao 1 chau dung chat long co khoi luong rieng D=900kg/m3.tinh luc day ac-si-met tac dung len vat do.
buong vat ra ,khi can bang thay vat khong cham day chau va nam thang dung .tinh chieu cao cua phan chim trong chat long.
1 o to chuyen dong thang voi van toc 54 km/h va 1 tau hoa chuyen dong theo phuong chuyen dung cua o to voi van toc 36km/h.xac dnh van toc cua o to so voi tau hoa trong 2 truong hop sau:
a)o to chuyen dong nguoc chieu so voi tau hoa
b)o to chuyen dong cung chieuso voi tau hoa