2.235²+0.765×4.47+0.765²
=2.235² +(3-2.235)*(2*2.235)+(3-2.235)²
=(2.235+3-2.235)²
=9
2.235²×0.765×4.47²+0.765² 怎么用简便运算?可能应该用乘法公式计算吧?很
2.235²×0.765×4.47²+0.765² 怎么用简便运算?可能应该用乘法公式计算吧?很
2.235²+0.765×4.47+0.765² 应该是这样，不好意思呀！
2.235²+0.765×4.47+0.765² 应该是这样，不好意思呀！
数学人气：274 ℃时间：2020-06-24 18:20:43
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