(x-5)+(x-3)+x+(x+3)+(x+5)=45,x等于?

问题描述:

(x-5)+(x-3)+x+(x+3)+(x+5)=45,x等于?

(x-5)+(x-3)+x+(x+3)+(x+5)=45
x-5+x-3+x+3+x+5=45
5x+(一5一3+3+5)=45
5x+0=45
x=9

(x-5)+(x+5)=2x
(x-3)+(x+3)=2x
(x-5)+(x-3)+x+(x+3)+(x+5)=45
5x=45
x=9
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(x-5)+(x-3)+x+(x+3)+(x+5)=45
5x=45
x=9