(90-x)+(180-x)=180 怎么算?

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(90-x)+(180-x)=180 怎么算?
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(90-x)+(180-x)=180 怎么算?
(90-x)+(180-x)=180 怎么算?

(90-x)+(180-x)=180 怎么算?
(90-x)+(180-x)=180
90-x+180-x=180
270-2x=180
2x=270-180
2x=90
x=45
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(90-x)+(180-x)=180
90-x+180-x=180
270-2x=180
180=270-2x
2x=90
x=45

90-x+180-x=180
270-2x=180
2x=90
x=45

90-X+180-X=180
90+180-180=X+X
90=2X
X=90÷2
X=45