mình nghĩ là c 

Ta có: [Math Processing Error]14428=367;12121515=45

MSC: 280

[Math Processing Error]58=5×358×35=175280

[Math Processing Error]367=36×407×40=1440280

[Math Processing Error]

One day,Peter was bored . He was in his room and his mother was cooking in the kitchen . She asked loudly ''Where are you , Peter ? '' He answered , '' I'm upsairs , Mum. '' His mother heard him running down and said'' Don't run down the stairs! '' Peter replied '' OK,I won't do it again,Mum.''

One day,Peter was bored . He was in his room and his mother was cooking in the kitchen . She asked loudly ''Where are you , Peter ? '' He answered , '' I'm upsairs , Mum. '' His mother heard him running down and said'' Don't run down the stairs! '' Peter replied '' OK,I won't do it again,Mum.''

One day,Peter was bored . He was in his room and his mother was cooking in the kitchen . She asked loudly ''Where are you , Peter ? '' He answered , '' I'm upsairs , Mum. '' His mother heard him running down and said'' Don't run down the stairs! '' Peter replied '' OK,I won't do it again,Mum.''

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