[Toán 9]Đại số

M

meomeodn

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P

popstar1102



$75(4^{1993}+4^{1992}+.....+4^2+5)+25$

=$25.(4-1)(4^{1993}+4^{1992}+......+4^2+4+1)+25$

=$25(4^{1994}-1)+25$=$25.4^{1994}$
 
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