解:设这个角的度数是X度,则它的余角是(90-X)度,它的补角是(180-X)度
90-X=1/3×(180-X)
90-X=60-X/3
X-X/3=90-60
2X/3=30
X=30÷(2/3)
X=30×3/2
X=45
这个角是45度
设这个角为x度,它的余角为(90-x)度,补角为(180-x)度,则(90-x)=(180-x)/3,x=45度
解:设这个角度为x
90-x=(1/3)(180-x)
90-x=60-(x/3)
(2/3)x=30
x=45
设这个角为X
90-x=1/3(180-x)
270 - 3x=180-x
2x=270-180
2x=90
x=45
(90-x)/(180-x)=1/3
解得x=45°