Question

根号32-根号50-4根号1/8=?4（2-x-1）2次方=9求x (2x-1)3次方+8=0求x拜托各位大神

Answer 1

√32-√50-4√1/8 =4√2-5√2-√2 =-2√2 4（2-x-1）^2=9 (1-x)^2=9/4 1-x=±3/2 x=5/3或x=-1/2 （2x-1）^3+8=0 (2x-1)^3=-8 (2x-1)=-2 2x=-1 x=-1/2