7+7-7+7-7可以改写成乘法算式吗?
问题描述:
7+7-7+7-7可以改写成乘法算式吗?
答
不能。7+7-7+7-7
=(7+7+7)-(7+7)
=7×3-7×2
=21-14
=7
答
7*1=7
答
7+7-7+7-7
=(7+7+7)-(7+7)
=7×3-7×2
=21-14
=7
答
7+7-7+7-7
=(7+7+7)-(7+7)
=7×3-7×2
=7×(3-2)
=7