9X(4x-7)—(6x+5)(6x—5)+38=0
问题描述:
9X(4x-7)—(6x+5)(6x—5)+38=0
答
9X(4x-7)—(6x+5)(6x—5)+38=0
36x^2-63x-36x^2+25+38=0
63x=25+38
63x=63
x=1