Toán Lớp 4: so sánh:
1 / 1 x 2 + 1 / 2 x 3 + 1 / 3 x 4+ … + 1 / 9 x 10 và 1 / 2 x 2 + 1 / 3 x 3 + 1 / 4 x 4+ …+ 1 / 10 x 10
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Toán Lớp 4: so sánh:
1 / 1 x 2 + 1 / 2 x 3 + 1 / 3 x 4+ … + 1 / 9 x 10 và 1 / 2 x 2 + 1 / 3 x 3 + 1 / 4 x 4+ …+ 1 / 10 x 10
Comments ( 2 )
1/(2xx3)>1/(3xx3)
1/(3xx4)>1/(4xx4)
…
1/(9xx10)>1/(10xx10)
=>1/(1xx2) + 1 / (2 xx 3) + 1 / (3 xx 4)+ … + 1 / (9 xx10)>1 / (2 xx 2) + 1 / (3 xx 3) + 1 / (4 xx 4)+ …+ 1 / (10 xx 10)