(120- x/10 ×6)(160 x)=19380(120-x/10 ×6)(160 x)=19380
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(120-x/10×6)(160x)=19380(120-x/10×6)(160x)=19380(120-x/10×6)(160x)=19380(120-x/10×6)(160x)=19380(120
(120- x/10 ×6)(160 x)=19380(120-x/10 ×6)(160 x)=19380
(120- x/10 ×6)(160 x)=19380
(120-x/10 ×6)(160 x)=19380
(120- x/10 ×6)(160 x)=19380(120-x/10 ×6)(160 x)=19380
两边乘-5/3
(x-200)(x+160)=-32300
x²-40x+300=0
(x-10)(x-30)=0
x=10,x=30