Ngày tải lên :
19/06/2015, 13:15
... trỡnh y + y + = x + x + xy + y (2) iu kin: y 1, x 0, y x (2) y x + ( y y + 1) x + ( y xy y ) = y x + ( y 1)2 x2 + y( y x 1) = y + x ( y x 1) + 2y 1+ x = y + x y = x ... ( x 1) + ( y 2) = 25 y = y = Vy A(1;7) ; B (4;2) ; C (5; 1) Gii h phng trỡnh www.mathvn.com ng 0, 25 0, 25 0, 25 0, 25 2,00 0, 25 0, 25 0, 25 0, 25 0, 25 0, 25 0, 25 0, 25 2,00 x + y + = y x + (1) ... 12 1,00 0 ,5 0 ,5 0, 25 0, 25 1,00 0, 25 0, 25 0, 25 0, 25 2,00 0 ,5 0 ,5 0 ,5 0 ,5 2,00 0, 25 Do SAB l tam giỏc u cnh a nờn SH = 0 ,5 Th tớch chúp S.ABC l VS ABC 0, 25 T M k ng thng song song vi AC ct SA ti...