x =2.5(x-180)

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x=2.5(x-180)x=2.5(x-180)x=2.5(x-180)x=2.5(x-180)x=2.5x-4502.5x-x=4501.5x=450x=300

x =2.5(x-180)
x =2.5(x-180)

x =2.5(x-180)
x =2.5(x-180)
x=2.5x-450
2.5x-x=450
1.5x=450
x=300

x =2.5(x-180) 180=( )x( )x( )x( ) ×( ) 180/x+180/(x-2.5)=360/(x-1.5) x =2.5(x-180)解（X+X)+(X-X)+(X*X)+(X/X)=100 180=( )x( )=( )X( )=( )X( ) x+x-2.5+x-4=85 2*x*x+2.5x=13 x=? (x-2)+(x+2)+(x/2)+(2*x)=180 X乘X减2.5X=6,　　求X! X+¼X=180 x+180%x=3.2 180-x/x=18% (X-180)/X=0.3 x-0.2.x=180 x×5x=180 5X=180+X ２.5x-x=15