Question

二分之一 ( 根号2+根号3) - 四分之三(根号2+根号27)

Answer 1

1/2*(根号2+根号3)-3/4*(根号2+根号27)
=根号2(1/2-3/4)+根号3(1/2-9/4)
=-根号2/4-7根号3/4

Answer 2

-4分之根2-4分之7倍的根3

Answer 3

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