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phamdiepthichmeo24112003
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1) a, {2019-2018^0[2 ³.5- (-1)^2018. 1/2^19.(2.5^2-2^4.3)^20]}+38 b,tìm các chữ số x,y sao cho:xy-2x-y=-5 2) a,Cho B=1+3 ²+3^4+3^6+...+3^46. Tìm chữ số tận cùng của 8B+5 b, Tìm các chữ số x,y để M=8x5y31chia hết cho 3 và x-y=4
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