根号21减去根号22与根号22减去根号23,比较大小.
问题描述:
根号21减去根号22与根号22减去根号23,比较大小.
答
√21-√22=(√21-√22)/1上下同时乘以(√21+√22)(√21-√22)(√21+√22)/1(√21+√21)=-1/(√21+√21)√22-√23=(√22-√23)/1上下同时乘以(√22+√23)(√22-√23)(√22+√23)/1(√22+√23)=...