2*【根号2+根号3】+3*【根号9-三分之二根号2】-3^3=?
问题描述:
2*【根号2+根号3】+3*【根号9-三分之二根号2】-3^3=?
答
2*【根号2+根号3】+3*【根号9-三分之二根号2】-3^3
=2根号2+2根号3+9-2根号2-27
=2根号3-18