32=2×4²1/2=2/2²所以原式=4√2-3√2/2+√2=(4-3/2+1)√2=7√2/2
√32-3√(1/2)+√2=4√2- 3√2/2 +√2=7√2/2
=4√2-3/2√2+√2=7/2√2
