Question

so sánh \(A=\frac{1x3x5+2x6x10+4x12x20+7x21x35}{1x5x7+2x10x14+4x20x28+7x35x49}vớiB=\frac{308}{708}\)

Answer 1

A = \(\frac{1.3.5+2.6.10+4.12.20+7.21.35}{1.5.7+2.10.14+4.20.28+7.35.49}\)

A = \(\frac{1.3.5.\left(1+8+64+343\right)}{1.5.7.\left(1+8+64+343\right)}\)

A = \(\frac{1.3.5}{1.5.7}\)

A = \(\frac{3}{7}=\frac{231}{539}\)

B = \(\frac{308}{708}=\frac{77}{177}=\frac{231}{531}\)

Vì \(\frac{231}{539}

Answer 2

mấy bạn bị ngu à