How much is 14 * 1 of 7 and 19, 5 * 1 of 8, 3 / 1 of 7 and 3 of 7?

How much is 14 * 1 of 7 and 19, 5 * 1 of 8, 3 / 1 of 7 and 3 of 7?

7 and 14 / 19 * 1 and 5 / 8 * 1 and 3 / 7 / 1 and 3 / 7 = 147 / 19 * 13 / 8 * 10 / 7 / (10 / 7) = 5 and 67 / 114

In the triangle ABC, B is equal to 6O degrees, and the square of B is equal to AC?

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In △ ABC, ∠ B = 40 °, the line passing through point a divides the triangle into two isosceles triangles, then the degree of ∠ C is___ ．

There are three cases: ① ad = AC, ∵ ad = BD, ∵ B = ∵ bad = 40 °, ∵ ad = AC, ∵ C = ∵ ADC = ∵ B + ∵ bad = 80 °, ② AC = DC, ∵ AC = DC, ∵ DAC = ∵ ADC =