用竖式计算
134×63=
[ ]
A.9407
B.6237
C.8442
D. 7422
300×20=
A.6000
B.800
C.720
16×50=
3050×60=
A.183000
B.41600
C.9030
D.1000
520×80=
25×40=
105×86=
300×(315÷9)=
A.10500
B.7120
C.9800
D.8120
140×(460-390)=
(307+99)×20=