7.8乘以6.1+7.8+3.9的简便算法谢谢了,
问题描述:
7.8乘以6.1+7.8+3.9的简便算法谢谢了,
答
7.8×6.1+7.8+3.9 =7.8×﹙6.1+1﹚+3.9 =7.8×7.1+3.9 =3.9×2×7.1+3.9 =3.9×﹙14.2+1﹚ =3.9×15.2 =59.28,可能是印刷错误,把最后一个运算符号的乘号错印成加号了.