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- 2已知a,b,c为三角型ABC的三条边,a2+b2+c2+50=10a+6b+8c,试判断三角形ABC的形状?
- 3已知三角形ABC的外心O重心G(1)设OH向量=OA向量+OB向量+OC向量求证,H是垂心
- 4一个正方体木块,表面积是48平方厘米,如果把它据成体积相等的8个小正方体,每个小正方体木块的表面积是多少
- 5l think Daniel will be a manager in ten years.(对manager提问)
- 6如图,∠A+∠B+∠C+∠D+∠E等于( ) A.180° B.360° C.540° D.720°
- 7My father is not ( )the moment.A.at at B.in at C.in to选哪个,为什么
- 8一根钢管,用去五分之三米后,还剩五分之二.
- 9( )the radio,please.the baby is sleeping now
- 10communicate don't your with why you parents friendly连词成句