0.7777×0.7+0.1111×2.1=?

问题描述:

0.7777×0.7+0.1111×2.1=?

0.7777×0.7+0.1111×2.1
=0.1111×4.9+0.1111×2.1
=0.1111×(4.9+2.1)
=0.1111×7
=0.7777