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Tính c= -1/3 x(1+2+3)-1/4x(1+2+3+4)-........-1/50x(1+2+3+......+50)
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IV. There is one mistake in each sentences . Find and correct it 1 . There isn't some water in the glass _______________________________ 2 . There are a 3 children talking with the teacher ________________________________ 3 . Are there some air - conditioners in the attic ______________________________ 4 . Is there any windows in the classroom ____________________________ 5 . There aren't some pencils in the pencil case _____________________________ 6 . There is some people in the bactyard _______________________________ 7 . There are any pictures on the wall ______________________________ 8 . Is there some boy in the living room ____________________________ 9 . There are any magazines on the table ______________________________ 10 . There are a biscuit on the plate ___________________________ VI . Rearrange the words to make right sencentes 1 . trees / many / park / are / the / there / ? / in ________________________ 2 . next / house / bank / is / the / to / the / . _______________________ 3 . a / is / my / garden / there / big / house / behind . ______________________ 4 . many / how / students / there / school / Lan's / in / are / ? _____________________ 5 . front / a / house / there / of / yard / your / is / in / smaill ? ________________________ Giúp mình với

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