18×4=
[ ]
A.43
B.72
C.900
21个15是
103的46倍是
用竖式计算
360×20=
A.7200
B.8460
C.8520
284×30=
180×47=
297×21=
A.9407
B.6237
C.8442
409×23=
134×63=
D. 7422
8×8+3=
A.0
B.800
C.67