Who can heip me!1.一个角的余角比它的补角的1/3少20度,求这个角．设这个角是x．．．

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Who can heip me!1.一个角的余角比它的补角的1/3少20度,求这个角．设这个角是x．．．
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Who can heip me!1.一个角的余角比它的补角的1/3少20度,求这个角．设这个角是x．．．
Who can heip me!
1.一个角的余角比它的补角的1/3少20度,求这个角．
设这个角是x
．．．

Who can heip me!1.一个角的余角比它的补角的1/3少20度,求这个角．设这个角是x．．．
设这个角是x
余角＝90-x
补角＝180-x
一个角的余角比它的补角的1/3少20度
所以1/3（180-X）－20＝90-x
60-x/3-20＝90-x
2x/3＝90-40
x＝75°

(90-x)=1/3(180-x)-20
90-x=60-1/3x-20
50=2/3x
x=75

设这个角是x (度, 以下单位都为度)
90 - x = ( 180 - x )/3 - 20
x = 75
答:这个角是75度

那么余角就是90-X，补角就是180-X，
所以，（90-X）+20=1/3（180-X）
X=75

设这个角为x.
90-x=1/3(180-x)-20
x=75
∴这个角75度

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