估算:
24560+11260=
21410+21210=
15610+21000=
90410+21060=
95230+21245=
91210+21260=
估算:
705500-50800≈
5035433-205000≈
305500-108900≈
805433+205000≈
855500-579900≈
533533-205130≈
估算:
905500-500900≈
403553-205000≈
505500-408900≈
703543-205050≈
803033-205010≈
805500-508900≈
试题篮
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