Toán Lớp 6: chứng minh rằng (2+2 ²+2 ³+…2 ²(mủ 200))chia hết cho 3
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Toán Lớp 6: chứng minh rằng (2+2 ²+2 ³+…2 ²(mủ 200))chia hết cho 3
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=(2+2^2+2^3+2^4)+…………(2^197+2^198+2^199+2^200)
=1.(2+2^2+2^3+2^4)+……………+2^197.(2+2^2+2^3+2^4)
=1.30+……….+2^197. 30
=30.(1+……..+2^197)
Vì 30vdots3
=>30.(1+……..+2^197)vdots3
=>Bvdots3