6t+3/2t*2-9=11/2t*2+54-30t的值

Question

6t+3/2t*2-9=11/2t*2+54-30t
的值

Answer 1

移项
4t²-36t=-63
t²-9t=-63/4
t²-9t+81/4=-63/4+81/4=9/2
(t-9/2)²=(±3√2/2)²
t-9/2=±3√2/2
t1=(9-3√2)/2.t2=(9+3√2)/2