看图片完成对话。
A: When is your birthday?
B: My birthday is on____.
A: What will you do on your birthday?
B: I'll ____.
A: Cool! When is your mother's birthday?
B: It's on____.
A: What will you do for your mother?
B: I'll____.(为她做蛋糕)
A: Great!
在平面直角坐标系中,点A(l,3)关于原点O对称的点A′的坐标为( )
—There are____ ____.
已知10x=5,10y=6,求:
(1)102x+y;
(2)103x﹣2y.