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A 题组新编1 .( 1 ) f( x) =x2x - 1 ( x 1 )的最小值为.( 2 ) f ( x) =x3x - 1 ( x 1 )的最小值为.( 3) f ( x) =x3x2 - 1 ( x 1 )的最小值为.2 .( 1 )三棱锥的三个侧面中最多可能有个直角三角形 .( 2 )四棱锥的四个侧面中最多可能有个直角三角形 .( 3) n( n≥ 5)棱锥中 ,
The maximum number of questions in group A is 1(1) f( x) = x2x - 1 (x 1) is the minimum value of (2) f (x) = x3x - 1 (x 1) is the minimum value. (3) The minimum value of f (x) =x3x2 - 1 (x 1) is .2. (1) There may be at most one right-angled triangle among the three sides of the pyramid. (2) There may be at most one of the four sides of the pyramid. Right-angled triangles. (3) n (n≥ 5) pyramids,