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t.锐角△ABC中,A,B,C为内角,比较sinA+sinB+sinc与妄的大小.(河北省滦县二中(063700) 孙晓香) f1 7COSff+13cos盘一172.已知 。 【17sinc~一13sir蝎①② 且a,卢均为锐角.求导+卢的值. (浙江省绍兴鲁迅中学(312008) 何建松)3.已知’r.y.z满足方程组:k+Xy+T’y“一25 (D.1÷y。托?
t. acute angle △ ABC, A, B, C for the internal angle, compare the size of sinA + sinB + sinc and 妄. (Hebei Province Ji County II (063700) Sun Xiaoxiang) f1 7COSff + 13cos disc 172. known. [17sinc~13sir蝎12 and a, Lu are both acute angles. Derivation + Lu value. (Zhejiang Shaoxing Lu Xun High School (312008) He Jiansong) 3. Known ’ryz satisfies the equation: k+Xy+T’y ”One 25 (D.1÷y. Care?