x+{x/5}+{x/5}3得180
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x+{x/5}+{x/5}3得180x+{x/5}+{x/5}3得180x+{x/5}+{x/5}3得180x+x/5+3x/5=1805x+x+3x=9009x=900x=100
x+{x/5}+{x/5}3得180
x+{x/5}+{x/5}3得180
x+{x/5}+{x/5}3得180
x +x /5+3x /5=180
5x +x +3x =900
9x =900
x =100