300-(17-18)-(16-17)-(15-16)-(14-15)-(13-14)-(12-13)-(11-12)计算过程

问题描述:

300-(17-18)-(16-17)-(15-16)-(14-15)-(13-14)-(12-13)-(11-12)计算过程

300-(17-18)-(16-17)-(15-16)-(14-15)-(13-14)-(12-13)-(11-12)
=300-(-1)-(-1)-(-1)-(-1)-(-1)-(-1)-(-1)
=300+7
=307