口算 55+37=________ | 80-26=________ | 1400-800=________ | 2+210=________ | 9+300=________ |
82+0=________ | 1-=________ | +=________ | -=________. |
口算 55+37=________ | 80-26=________ | 1400-800=________ | 2+210=________ | 9+300=________ |
82+0=________ | 1-=________ | +=________ | -=________. |