(X-120)[70-(X-130)]=1600 ,

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(X-120)[70-(X-130)]=1600,(X-120)[70-(X-130)]=1600,(X-120)[70-(X-130)]=1600,(x-120)(200-x)=1600x平方-32

(X-120)[70-(X-130)]=1600 ,
(X-120)[70-(X-130)]=1600 ,

(X-120)[70-(X-130)]=1600 ,
(x-120)(200-x)=1600
x平方-320x+25600=0
(x-160)平方=0
x1=x2=160