1 / v +(3v + 12)/(v ^ 2-5v)=(7v-56)/(v ^ 2-5v)をどのように解き、余分な解を調べますか?

1 / v +(3v + 12)/(v ^ 2-5v)=(7v-56)/(v ^ 2-5v)をどのように解き、余分な解を調べますか?
Anonim

回答:

#v = 21#

説明:

#1 / v +(3v + 12)/(v ^ 2-5v)=(7v-56)/(v ^ 2-5v)#

#1 / v +(3v + 12)/(v ^ 2-5v) - (7v-56)/(v ^ 2-5v)= 0#

一般的な分母は #v ^ 2-5v = v(v-5)#

#(v-5 + 3v + 12-(7v-56))/(v ^ 2-5v)= 0#

#(v-5 + 3v + 12-7v + 56)/(v ^ 2-5v)= 0#

#(v + 3v-7v-5 + 12 + 56)/(v ^ 2-5v)= 0#

#( - 3v + 63)/(v ^ 2-5v)= 0#

#-3v + 63 = 0#

#-3v = -63#

#v =( - 63)/( - 3)#

#v = 21#