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A = \(\dfrac{1\times3\times5+2\times6\times10+3\times9\times15}{3\times5\times12+6\times10\times24+9\times15\times36}\)
A = \(\dfrac{1\times3\times5+2\times6\times10+3\times9\times15}{3\times5\times12+6\times10\times2\times12+9\times15\times3\times12}\)
A = \(\dfrac{1\times3\times5+2\times6\times10+3\times9\times15}{12\times\left(1\times3\times5+6\times10\times2+9\times15\times3\right)}\)
A = \(\dfrac{1\times3\times5+2\times6\times10+3\times9\times15}{12\times\left(1\times3\times5+2\times6\times10+3\times9\times15\right)}\)
A = \(\dfrac{1}{12}\)
A = 1×3×5+2×6×10+3×9×153×5×12+6×10×24+9×15×36
A = 1×3×5+2×6×10+3×9×153×5×12+6×10×2×12+9×15×3×12
A = 1×3×5+2×6×10+3×9×1512×(1×3×5+6×10×2+9×15×3)
A = 1×3×5+2×6×10+3×9×1512×(1×3×5+2×6×10+3×9×15)
A = 112
\(A=\frac{1X2X3+2X4X6+4X8X12+8X16X24}{2X3X4+4X6X8+8X12X16+8X24X32}\)
\(A=\frac{1+1+1+1}{4+4+4+2}\)
\(A=\frac{4}{14}\)
CHÚC BẠN HỌC GIỎI !
\(\frac{1x3x5+2x6x10+4x12x20}{1x5x7+2x10x14+4x20x28}\)
\(=\frac{1x5x3+2x10x6+4x20x12}{1x5x7+2x10x14+4x20x28}\)
\(=\frac{3+6+12}{7+14+28}\)
\(=\frac{21}{49}\)
\(A=\frac{1x5x6+2x1x2x5x2x6+8x1x2x5x4x6}{1x3x5+2x1x2x3x2x5+8x1x2x3x4x5}\)
\(A=\frac{1x5x6+2x2x2x1x5x6+8x2x4x1x5x6}{1x3x5+2x2x2x1x3x5+8x2x4x1x3x5}\)
\(A=\frac{1x5x6x\left(1+2x2x2+8x2x4\right)}{1x3x5x\left(1+2x2x2+8x2x4\right)}=\frac{6}{3}=2\)
\(A=\frac{1.2.3+2.4.6+3.6.9}{1.3.5+2.6.10+3.9.15}=\frac{2\left(1.3+2.2.6+3.3.9\right)}{5\left(1.3+2.2.6+3.3.9\right)}=\frac{2}{5}\)
46656/729000
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