x分之80=2.5*{x+2.5}分之80.

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x分之80=2.5*{x+2.5}分之80.

x分之80=2.5*{x+2.5}分之80.
x分之80=2.5*{x+2.5}分之80.

x分之80=2.5*{x+2.5}分之80.

望采纳

80/x=2.5*80/(x+2.5)
x=5/3

x+(x-80)+(x-3)/2=416 x+x-80+(x-3)/2=416 2x+(x-3)/2=416+80 2x+(x-3)/2=496 2*2x+2*(x-3)/2=2*496 4x+x-3=992 5x=992+3 5x=995 x=199