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Ta có: \(\dfrac{-371}{-459}=\dfrac{371}{459}\) là một số dương
=> \(\dfrac{-371}{-459}>\dfrac{-371}{159}\)
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\(4^{59}< 4^{60}\)
Ta có:
\(4^{60}=\left(4^3\right)^{20}=64^{20}\)
\(3^{80}=\left(3^4\right)^{20}=81^{20}\)
Mà: \(81>64\)
\(\Rightarrow81^{20}>64^{20}\)
\(\Rightarrow3^{80}>4^{60}\)
\(\Rightarrow3^{80}>4^{59}\)
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\(a,\dfrac{-15}{17}=-1+\dfrac{2}{17}\\ -\dfrac{19}{21}=-1+\dfrac{2}{21}\\ Vì:\dfrac{2}{17}>\dfrac{2}{21}\Rightarrow-1+\dfrac{2}{17}>-1+\dfrac{2}{21}\Rightarrow-\dfrac{15}{17}>-\dfrac{19}{21}\\ b,-\dfrac{24}{35}=-1+\dfrac{11}{35};-\dfrac{19}{30}=-1+\dfrac{11}{30}\\ Vì:\dfrac{11}{35}< \dfrac{11}{30}\Rightarrow-1+\dfrac{11}{35}< -1+\dfrac{11}{30}\\ \Rightarrow-\dfrac{24}{35}< -\dfrac{19}{30}\)
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15) 672 - (500 - 328)
= 672 - 500 + 328
= (672 + 328) - 500
= 1000 - 500
= 500
BẠN PHÁ NGOẶC ĐỔI DẤU CÁC SỐ TRONG NGOẶC ĐỂ TÍNH
VD 15)672-(500-328)
=672-500+328
=672+328-500
=1000-500=500
OK
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[(321 - 797) + (-321 + 697)] - 371 - [1900 + (-371)]
= [321 - 797 - 321 + 697] - 371 - 1900 + 371
= [321 - 321 - 797 + 697] - 371 + 371 - 1900
= -100 - 1900
= -2000.
Học tốt.
\(\left[\left(321-797\right)+\left(-321+697\right)\right]-371-\left[1900+\left(-371\right)\right]\)
\(=321-797-321+697-371-1900-371\)
\(=\left(321-321\right)-\left(797-697\right)-\left(371-371\right)-1900\)
\(=0-100-0-1900\)
\(=-100-1900\)
\(=-2000\)
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