(2a-0.1a平方)分之(10-2a+0.1a平方)=51分之49 求a的解.
问题描述:
(2a-0.1a平方)分之(10-2a+0.1a平方)=51分之49 求a的解.
答
(2a-0.1a平方)分之(10-2a+0.1a平方)=51分之49
(10-2a+01a^2)/(2a-0.1a^2)=49/51
(10-2a+01a^2+2a-0.1a^2)/(2a-0.1a^2)=(49+51)/51
10/(2a-0.1a^2)=100/51
a^2-20a+51=0
(a-3)(a-17)=0
a=3,a=17