6.2345²+0.2345²-6.2345×0.469
=6.2345²-2x6.2345x0.2345+0.2345²
=(6.2345-0.2345)²
=6²
=36
如果本题有什么不明白可以追问,=6.2345²-2x6.2345x0.2345+0.2345²这一步是什么意思6.2345×0.469=2x6.2345x0.2345 呀