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lilianna25
24.09.2021 •
Mathematics
Cho ΔABC cân tại A .Kẻ đường phân giác ∠B và ∠C lần lượt cắt AB và AC tại M và N. BM ∩ CN tại I:
a) Chứng minh ΔIBC là tam giác cân
b) Chứng minh ΔNBC= ΔMCB
c) Chứng minh AI là tia phân giác
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Ответ:
75
Step-by-step explanation:
To find the value of 6c-15, we first want to finc the value of c. Once we find c, we can plug it in and solve.
-5c+6=-69 [subtract both sides by 6]
-5c=-75 [divide both sides by -5]
c=15
Now that we have the value of c, we can plug it in and solve.
6(15)-15 [multiply]
90-15 [subtract]
75
The value is 75.