Toán Quy đồng mẫu các số phân sau: -3/16,5/24,-21/56 26/11/2021 By Eliza Quy đồng mẫu các số phân sau: -3/16,5/24,-21/56
`MC = 336` `(-3)/16 = (-3.21)/(16.21) =(-63)/336` `5/24 = (5.14)/(24.14) =70/336` `(-21)/56 = (-21.6)/(56.6) = (-126)/336` Trả lời
16=2^4 24=2³×3 56=2³×7 => BCNN(16; 24; 56)=2^4×3×7=336 => $\frac{-3}{16}=$ $\frac{-3×21}{16×21}=$ $\frac{-63}{336}$ $\frac{5}{24}=$ $\frac{5×14}{24×14}=$ $\frac{70}{336}$ $\frac{-21}{56}=$ $\frac{-21×6}{56×6}=$ $\frac{-126}{336}$ Trả lời
`MC = 336`
`(-3)/16 = (-3.21)/(16.21) =(-63)/336`
`5/24 = (5.14)/(24.14) =70/336`
`(-21)/56 = (-21.6)/(56.6) = (-126)/336`
16=2^4
24=2³×3
56=2³×7
=> BCNN(16; 24; 56)=2^4×3×7=336
=> $\frac{-3}{16}=$ $\frac{-3×21}{16×21}=$ $\frac{-63}{336}$
$\frac{5}{24}=$ $\frac{5×14}{24×14}=$ $\frac{70}{336}$
$\frac{-21}{56}=$ $\frac{-21×6}{56×6}=$ $\frac{-126}{336}$