Chứng minh rằng: với mọi số tự nhiên n, n không chia hết cho 5 Thì (n^4 – 1) chia hết cho 5

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1. I /the/ I’ll /caves/ explore/ think/. ................................................................... 2. know /He /doesn’t/. /He/ boat/ may/ the/ take/ a /trip/ islands/ around/. ..................................................................................................................................... 3. Phuong/, /build/ Tuan/ and/ Hoa/ may/ beach/ sandcastles /the/ on/. .......................................................................................................................... 4. My/ will/ the/ family/ and/ sea/ I/ swim/ in/. ........................................................................... 5. Seaside/ They’ll /be /the/ on/ at /Sunday/. ........................................................................... 6. islands/ She’ll /Monday/ visit/ the/ on/. ............................................................................. 7. be/ Where/ will/ Saturday/ you /on/? ......................................................................... 8. and /I /think /school /Mai/ I /be /at/ will/. ............................................................................ 9. countryside /The/ will /month /boys/ be/ in/ the/ next/. ............................................................................................ 10. I/ think/ tomorrow/ I’ll /the/ mountains /visit/. .................................................................................................................................. 11.English / have / students / don’t / on / lessons / Saturdays/. .................................................................................................................................. 12.have / in / only / on / they / lessons / morning / the / weekdays/. .................................................................................................................................. 13.Maths/ My/ times/ class/ week/ have/ a/ lessons/ six/. ................................................................................................................................. 14.have / in / exams / students / their / the / May/. .................................................................................................................................. 15.always / homework / they / their / in / evening / the / do/. .................................................................................................................................. 16.is / television / moment / she / at / watching / the/. .................................................................................................................................. 17.does/ How/ lessons/ she/ Thursday/ many/ have/ on/? .................................................................................................................................. 18.They/ week/ have/ times/ lessons/ three/ a/ English/.