tren tia Ox lay 2 diem A va B sao cho OA = 2cm , OB = 7cm . Tren tia BA diem lay diem C sao cho BC = 3 cm .Khi do CA = ....cm
cho xôy = 80 ^0 . Tia O z la tia doi cua tia Ox , tia Ot la tia doi cua tia Oy .Khi do zOt = ......^0
mot vuon trong 420 cay an qua , trong do 2 phan 5 la cam , 50 % la hong xiem con lai la buoi . Vay so cay buoi la ... cay
tim x biet 5phan 8 x - 1 phan 8 = 23 phan 4 . Tra loi x =...... ( Nhap ket qua dang so thap phan gon nhat )
ba tam vai co tong chieu dai la 126 cm .Tam thu nhat dai gap hai lan tam thu ba va ngan hon tam thu hai la 6 m . Khi do do dai tam giai thu ba la........cm
tim x biet 5 ( x + 35 ) = 115 tra loi x = .....
tim x biet (x - 5) .3 = 3 ^3 tra loi x =.......
so tu nhien lon nhat co bon chu so sau cho khi chia cho 11;13;17 deu du 7 la ......
