Toán Lớp 6: A=2+2^2+2^3+2^4+…+2^100.CMR A chia hết cho 15.hèo mi
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Toán Lớp 6: A=2+2^2+2^3+2^4+…+2^100.CMR A chia hết cho 15.hèo mi
Comments ( 1 )
A=(2+2^2+2^3+2^4)+……………….+(2^97+2^98+2^99+2^100)
A=1.(2+2^2+2^3+2^4)+………………+2^96.(2+2^2+2^3+2^4)
A=1.30+…………………..+2^96. 30
A=30.(1+……………….+2^96)
Vì 30vdots15
=>Avdots15