(x-8)(-20+400)=640

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(x-8)(-20+400)=640(x-8)(-20+400)=640(x-8)(-20+400)=640方法一:(x-8)(-20+400)=640(x-8)*380=640(x-8)*19=32

(x-8)(-20+400)=640
(x-8)(-20+400)=640

(x-8)(-20+400)=640

方法一:
(x-8)(-20+400)=640
(x-8)*380=640
(x-8)*19=32
19x-152=32
19x=32+152
19x=184
x=184/19


方法二:
(x-8)(-20+400)=640
(x-8)*380=640
380x-3040=640
380x=640+3040
380x=3680
x=184/19

-20x+400x+160-3200=640
380x=3680
x=184/19

你好,很高兴回答你的问题

(x-8)(-20+400)=640
(x-8)*380=640
380x-3040=640
380x=640+3040
380x=3680
x=184/19

380(x-8)=640
380x-3040=640
380x=3680
x=184/19