A:went through
B:went over
C:got over
D:got through
竖式计算。
①3.8+4.6=
②6.2+7.9=
③12.4-2.8=
④12-2.4=
— _____ are they from?
—They are from Tokyo.
如图,已知过A、C、D三点的圆的圆心为E,过B、E、F三点的圆的圆心为D,如果∠A=57°,那么∠ABC= ____°.