It is reported that there will be a ____（猛烈）storm tomorrow morning.

如果一个电子的德布罗意波长和一个中子的相等，则它们的（   ）也相等．

25+40=____  36-30=____ 78+20=____  86-40=____  50-8=____ 

39+6=____  87+9=____ 22+9=____  84-7=____  88+9=____ 63+8=____ 

52-7+7=____  63-60+6=____ 64-(8-6)= ____  23-7+20=____