1/2｛根号2+根号3｝-3/4｛根号2+根号27｝等于多少.

1/2｛根号2+根号3｝-3/4｛根号2+根号27｝等于多少.
1/2｛根号2+根号3｝-3/4｛根号2+根号27｝等于多少.

1/2｛根号2+根号3｝-3/4｛根号2+根号27｝等于多少.
1/2｛根号2+根号3｝-3/4｛根号2+根号27｝
=1/2√2+1/2√3-3/4×√2-3/4×3√3
= -1/4√2-7/4√3

1/2×（√2+√3）-3/4×（√2+√27）
=1/2×（√2+√3）-3/4×（√2+3√3）
=√2/2+√3/2-3√2/4+9√3/4
=-√2/2-7√3/4