Toán Lớp 6: A=1/3+1/3*2+1/3*3+….+1/3*100
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Toán Lớp 6: A=1/3+1/3*2+1/3*3+….+1/3*100
các ae tính hộ mình nha
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=>3A=1+1/3+1/3^2+1/3^3+…+1/3^99
=>3A-A=(1+1/3+1/3^2+1/3^3+…+1/3^99)-(1/3+1/3^2+1/3^3+….+1/3^100)
=>2A=1-1/3^100
=>2A=[3^100-1]/3^100
=>A=[3^100-1]/[3^100. 2]