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Toán Lớp 7: Cho tam giác ABC có góc A= 180°-3gócC. Chứng minh rằng: góc B= 2 góc C

Home/ Toán Lớp 7: Cho tam giác ABC có góc A= 180°-3gócC. Chứng minh rằng: góc B= 2 góc C

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