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Đường thẳng xx` cắt yy` tại O . Biết số đo góc xOy bằng 40 độ  . Tỉ sô giữa số đo góc x`Oy` và góc xOy`

hoang phuc
30 tháng 10 2016 lúc 9:11

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30 tháng 10 2016 lúc 9:15

sao lại chịu

Phan Thanh Tịnh
30 tháng 10 2016 lúc 9:23

\(\widehat{x'Oy'}=\widehat{xOy}=40^0\)(đối đỉnh) ;\(\widehat{xOy}+\widehat{xOy'}=180^0\Rightarrow\widehat{xOy'}=180^0-40^0=140^0\Rightarrow\frac{\widehat{x'Oy'}}{\widehat{xOy'}}=\frac{40^0}{140^0}=\frac{2}{7}\)

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17 tháng 9 2021 lúc 14:24

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Đinh Hữu  Quang
17 tháng 9 2021 lúc 14:32

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