若规定两数a,b通过运算*得4ab,即a* b=4ab,例如:2*6=4×2×6=48. (

若规定两数ab通过运算*4ab,即a* b4ab,例如:2*64×2×648

(1)3*5的值;

(2)x*x2*x2*40x的值;

(3)若不论x为什么值时,总有a*xx,求a的值.

答案

 (1)60     (2) x1=-4 x22   (3) a

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