=976-(148+52)
=976-200
=776 ( )改正:
=376-176+59
=200+59
=259 ( )改正:
835-169-31
743-(235+143)
824-224-176-124
671-24-16-60
1000-1-2-3-4-5-6-7-8-9-91-92-93-94一95-96-97-98-99