用简便方法计算:7.8*53.9+5.39*22用简便方法计算:0.01+0.02+0.03+0.04+···0.97+0.98+0.99
问题描述:
用简便方法计算:7.8*53.9+5.39*22
用简便方法计算:0.01+0.02+0.03+0.04+···0.97+0.98+0.99
答
用简便方法计算:7.8*53.9+5.39*22
用简便方法计算:0.01+0.02+0.03+0.04+···0.97+0.98+0.99