... 2dmax22LCUrP 120 Wr (Z Z ) (); Pmax = 125 (W); i 2,5cos(100 t 0,785)(A) b, R = 50 (); Pmax = 62,5 (W) ; c, R = 0 (); Pdmax = 120 (W) Bài 2: ... 21 2 1 2LH - - 12 LH thì maxy y 2 8 1 L 0 12 12 '(L)y - 0 + 0 - y -4 28 221 ... C R LU U (U U ) 120 U (U 56) (1) + 2 2 2 2 2 2 2 2 2MQ R L R L R LU U U 160 U U U 160 U (2) - Thay (2) vào 2 2 2 2 2L L L 120 160 U U 2.56.U...