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Câu 1: D
Câu 2: Các phân số tối giản là \(\dfrac{1}{9};\dfrac{2}{11}\)
Câu 3: Phân số lớn nhất là \(\dfrac{17}{3}\)
Câu 4:
\(76m^28cm^2=760008cm^2\)
Câu 5:
Gọi số cần tìm là x
Theo đề, ta có: \(\dfrac{4}{7}=\dfrac{x}{21}\)
=>\(x=4\cdot\dfrac{21}{7}=4\cdot3=12\)
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a)\(\left(\dfrac{4}{6}+\dfrac{14}{6}\right)+\left(\dfrac{7}{13}+\dfrac{19}{13}\right)+\left(\dfrac{17}{9}+\dfrac{1}{9}\right)=\dfrac{18}{6}+\dfrac{26}{13}+\dfrac{18}{9}=3+2+2=7\)
b)\(\dfrac{6}{7}+\left(\dfrac{2}{1}-\dfrac{6}{7}\right)=\dfrac{6}{7}+\left(\dfrac{14}{7}-\dfrac{6}{7}\right)=\dfrac{6}{7}+\dfrac{8}{7}=\dfrac{14}{7}=2\)
c)\(\dfrac{2}{3}\times\left(\dfrac{15}{19}+\dfrac{4}{19}\right)=\dfrac{2}{3}\times\dfrac{19}{19}=\dfrac{2}{3}\times1=\dfrac{2}{3}\)
a)(46+146)+(713+1913)+(179+19)=186+2613+189=3+2+2=7(46+146)+(713+1913)+(179+19)=186+2613+189=3+2+2=7
b)67+(21−67)=67+(147−67)=67+87=147=267+(21−67)=67+(147−67)=67+87=147=2
c)
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a: =(3/5+2/5)+(4/7+1/7+2/7)=1+1=2
b: =(12/13+8/13+6/13)+(2/7+5/7)=2+1=3
a) \(x+\dfrac{4}{5}=\dfrac{45}{5}-\left(\dfrac{3}{7}+\dfrac{3}{5}\right)\)
\(x+\dfrac{4}{5}=\dfrac{45}{5}-\dfrac{36}{35}\)
\(x+\dfrac{4}{5}=\dfrac{279}{35}\)
\(x=\dfrac{279}{35}-\dfrac{4}{5}\)
\(x=\dfrac{251}{35}\)
b) \(\dfrac{5}{8}\times x=\dfrac{4}{5}\)
\(x=\dfrac{4}{5}\div\dfrac{5}{8}\)
\(x=\dfrac{32}{25}\)
a) x + 4/5 = 45/5 - (3/7 + 3/5)
x + 4/5 = 45/5 - 36/35
x + 4/5 = 279/35
x = 279/35 - 4/5
x = 251/35
vậy x =...
b) 5/8 x X = 4/5
X = 5/8 : 4/5
X = 32/25
vậy x =...