A:{x+2y=52x+4y=10
B:{4x+10y=142x+5y=7
C:{x+2y=5x+3y=2
D:{x+y=32x+5y=7
— Maggie, what you said may result in serious problems.
— I see. I was just telling the truth.
某班七个合作学习小组人数如下:6,5,5,x,7,8,7的平均数是6,则x的值为( )
大陆与台湾的交往源远流长,早在元朝时,元政府就加强了对台湾的管辖,那时候台湾称为( )