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Câu 1:
a. $=-(35+65)+(22+88)=-100+110=110-100=10$
c. $=58(26+74)=58.100=5800$
b. $=29(38+63-1)=29.100=2900$
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8 ⋮ \(x\); 12 ⋮ \(x\); 24 ⋮ \(x\) ⇒ 8; 12; 24 ⋮ \(x\) ⇒ \(x\) \(\in\) ƯC(8;12;24)
8 = 23; 12 = 22.3; 24 = 22.3
ƯCLN(8; 12; 24) = 22 = 4
\(x\) \(\in\) {-4; -2; -1; 1; 2; 4}
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a ) 100-7(x-5)=58
=> 7(x-5)=42
=.> x-5 = 6
=> x=11
180-5(x+1)=30
=> 5(x+1)=150
=> x+1=30\
=> x=29
6x-5=613
=> 6x=618
=> x=103
a) \(100-7\left(x-5\right)=58\)
\(\Leftrightarrow7\left(x-5\right)=42\)
\(\Leftrightarrow x-5=6\)
\(\Leftrightarrow x=11\)
b) \(180-5\left(x+1\right)=30\)
\(\Leftrightarrow5\left(x+1\right)=150\)
\(\Leftrightarrow x+1=30\)
\(\Leftrightarrow x=29\)
c) \(6x-5=613\)
\(\Leftrightarrow6x=618\)
\(\Leftrightarrow x=103\)
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\(A=\dfrac{58}{7}-\left(\dfrac{31}{27}+\dfrac{30}{8}\right)\)
\(A=\dfrac{58}{7}-\dfrac{31}{27}-\dfrac{30}{8}\)
\(A=\dfrac{58}{7}-\dfrac{31}{27}-\dfrac{15}{4}\)
\(A=\dfrac{1349}{189}-\dfrac{15}{4}\)
\(A=\dfrac{2561}{756}\)
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-X=-30+58
=>-X=28
=>X=-28
Vậy X=-28
Michiel Girl Mít ướt : -(-x) thì = dương mà ?