1/2{根号2+根号3}-3/4{根号2+根号27}等于多少.

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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