老师说要写过程.19X+10(5-X)=230,(45+16.2)X=23.19X+10(5-X)=230,(45+16.2)X=23.重要是过程.

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老师说要写过程.19X+10(5-X)=230,(45+16.2)X=23.19X+10(5-X)=230,(45+16.2)X=23.重要是过程.
老师说要写过程.19X+10(5-X)=230,(45+16.2)X=23.
19X+10(5-X)=230,(45+16.2)X=23.
重要是过程.

老师说要写过程.19X+10(5-X)=230,(45+16.2)X=23.19X+10(5-X)=230,(45+16.2)X=23.重要是过程.
19X+10(5-X)=230
19X+10×5-10X=230
9X+50=230
9X=230-50
9X=180
X=180/9
X=20
------------------------------------
(45+16.2)X=23
61.2X=23
612X/10=23
612X=230
X=230/612
X=115/306