先找规律再填空. 16+17+18+19+20+21=______×______
题型:填空题
问题:
先找规律再填空.
16+17+18+19+20+21=______×______=______
320+330+340+350+360+370=______×______=______
59+58+57+56+54+53+52+51=______×______=______.
先找规律再填空.
16+17+18+19+20+21=______×______=______
320+330+340+350+360+370=______×______=______
59+58+57+56+54+53+52+51=______×______=______.