(1)10/X+6/(X+10)=1(2)(X-6)(X-4)/X^2=14/25

问题描述:

(1)10/X+6/(X+10)=1
(2)(X-6)(X-4)/X^2=14/25

1.X=25/8
2.12/5
现在没计算机.错了也不一定.最好验算下

(1)10(X+10)+6X=X^2+10X
X^2-6X-100=0
(2)(X-6)(X-4)/X^2=14/25
X^2-10X+24=14/25X^2
11X^2-250X+600=0
(11X-30)(X-20)=0
X=30/11或X=20

10x+100+6x=x"+10x x"-6x-100=0 x"-6x+9=109 (x-3)"=109 X=109开方+3 (2)14X"=25X"-250X+600 11X"-250X"+600=0 (11X-30)(X-20)=0 11X-30=0或X-20=0 X=30/11或X=20

X^2这是什么来?