... = 1 - 3.1,5 = - 3,5.c) ta.i a = . = * n¥u a tho+¬ = 1 - 5a - 4a = 1- 9athay a = , ta c¨: 1 - 9a = 1 - 9 .* n¥u a > tho+¬ = 5a - 1 - 4a = a - 1thay a = , ta c¨ a - 1 = - 1.d) 4x - ta.i ... ta.i x = - .4x - = * n¥u x tho+¬ = 4x - 3x - 1 = x - 1thay x = - , ta ®o+.c x - 1 = - - 1.* n¥u x < - tho+¬ = 4x + 1 + 3x = 7x +1thay x = - , ta ®o+.c 7x + 1 = 7 (- ) + 1 = 1 - 7 .ba`i ... x, ta că:f (-2 ) = . (-2 ) = ; f (-1 ) = . (-1 ) = - ; f(0) = .0 = 0; f( ) = . = f(1) = .1 = ; f(2) = . 2 = ; f(3) = .3 = 2.b) y = g(x) = x + 3g (-2 ) = . (-2 ) + 3 = ; g (-1 ) = . (-1 ) + 3 = - +3;g(0)...