已知根号2约等于1.41,根号3约等于1.73求根号12减2根号二分之一减3根号三分之一减16根号八分之一加根号18

原式=√12-2√(1/2)-3√(1/3)-16√(1/8)+√18
=2√3-2×√(2/4)-3×√(3/9)-16×√(2/16)+3√2
=2√3-2×(√2)/2-3×(√3)/3-16×(√2)/4+3√2
=2√3-√2-√3-4√2+3√2
=(2√3-√3)+(-√2-4√2+3√2)
=√3-2√2
=1.73-2×1.41
=1.73-2.82
= -1.09