当x=8时,x2=_,2x=_,x+2=_,x+x=_.

问题描述:

当x=8时,x2=______,2x=______,x+2=______,x+x=______.

当x=8时,
x2=82=64;
2x=2×8=16;
x+2=8+2=10;
x+x=8+8=16.
故答案为:64,16,10,16.