(s-2t/3s) 乘以(6s^2/s+2t)
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(s-2t/3s) 乘以(6s^2/s+2t)
(s-2t/3s) 乘以(6s^2/s+2t)
(s-2t/3s) 乘以(6s^2/s+2t)
(s-2t/3s) 乘以(6s^2/s+2t)
=2s(s-2t)/(s+2t)
(s-2t/3s) 乘以(6s^2/s+2t)
(s-2t/3s) 乘以(6s^2/s+2t)
(s-2t/3s) 乘以(6s^2/s+2t)
(s-2t/3s) 乘以(6s^2/s+2t)
=2s(s-2t)/(s+2t)