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\(a)\frac{11}{8}-\frac{7}{8}+\frac{3}{4}=\frac{4}{8}+\frac{3}{4}=\frac{2}{4}+\frac{3}{4}=\frac{5}{4}\)
\(b)\frac{24}{8}-\frac{5}{8}-3=(\frac{24}{8}-3)-\frac{5}{8}=3-3-\frac{5}{8}=-\frac{5}{8}\)
\(c)\)Tự làm
\(d)56\cdot78+8634=4368+8634=13002\)
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a.(4568+3759)-(4563+3764)
= 4568+3759-4563-3764
=(4568-4563)+(3759-3764)
=5+(-5)
=0
b.(56*27+56*35):62
=56*27+56*35:62
=56*(27+35):62
=56*62:62
=56*(62:62)
=56*1
=56
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6/5 = 30/25
8/7 = 24/21
25/45 = 5/9
56/24 = 7/3
Chúc bạn học tốt.
😁😁😁
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các phép tính trong ngoặc đều bằng 0
suy ra chỉ còn 2005 +69 = 2074
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a) a*15+a*7
=25*15+25*7
=375+175=550
b56*78+8634
=4368+8634=13002
P/s: (*) là dấu nhân
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a,\(2-\frac{5}{7}+\frac{9}{21}\)
\(=2-\frac{154}{147}\)
\(=\frac{135}{147}\)
b, \(\frac{5}{8}\):\(3+\frac{25}{24}\)
\(=\frac{5}{24}+\frac{25}{24}\)
\(=\frac{30}{24}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(G=\dfrac{7}{8}+\dfrac{11}{24}+\dfrac{5}{8}+\dfrac{23}{24}+\dfrac{11}{8}+\dfrac{13}{24}\\ \Rightarrow G=\left(\dfrac{7}{8}+\dfrac{5}{8}+\dfrac{11}{8}\right)+\left(\dfrac{11}{24}+\dfrac{23}{24}+\dfrac{13}{24}\right)\\ \Rightarrow G=\dfrac{23}{8}+\dfrac{47}{24}\\ \Rightarrow G=\dfrac{69}{24}+\dfrac{47}{24}\\ \Rightarrow G=\dfrac{116}{24}\\ \Rightarrow G=\dfrac{29}{6}\)
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a: 2964-x=1285
=>x=2964-1285
=>x=1679
b: Trung bình cộng của 56;23;71;19;36 là:
\(\dfrac{56+23+71+19+36}{5}=\dfrac{205}{5}=41\)
c: \(a\cdot b:c=201\cdot6:3=402\)
(23 + 24 + 25 + ...+ 57) x 0
=0