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a: \(=\dfrac{\left(1.6-1.6\right)\cdot\left(2.29-0.76\right)}{1.6+2.53}\cdot\dfrac{3.06:7.5+3.4\cdot0.38}{19-2.6\cdot0.5}=0\)
b: \(=\dfrac{17.8\cdot9.4-7.8\cdot9}{3-0.3\cdot0.3}=\dfrac{97.12}{2.4}=\dfrac{607}{15}\)
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\(19,8:0,25.7,2:0,125.8,4:0,5\)
\(=19,8.4.7,2.8.8,4.2\)
\(=79,2.57,6.16,8\)
\(=76640,256\)
\(6,6.8.2,4.4.16,8:0,2\)
\(=52,8.9,6.84\)
\(=42577,92\)
a) $19,8:0,25.7,2:0,125.8,4:0,5$
$=19,8:\dfrac{1}{4}.7,2:\dfrac{1}{8}.8,4:\dfrac{1}{2}$
$=19,8.4.7,2.8.8,4.2=76640,256$
b) $6,6.8.2,4.4.16,8:0,2$
$=6,6.8.2,4.4.16,8:\dfrac{1}{5}$
$=6,6.8.2,4.4.16,8.5=42577,92$
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mk ko viết lại đề nhé!
=>x . 5,2 =10,4 . 4,5
=>x . 5,2 = 46,8
=>x=9
Vậy x=9
CHÚC BN HỌC TỐT
NHỚ TK MK NHA
x.5,2:4,5=10,4 =>x.5,2 =10,4.4,5 =>x.5,2 =46,8 =>x =46,8:5,2 =>x =9
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\(25\%+\frac{1}{2}\left(x-\frac{4}{5}\right)=2,6\)
\(\frac{1}{4}+\frac{1}{2}\left(x-\frac{4}{5}\right)=2,6\)
\(\frac{1}{4}+\frac{1}{2}x-\frac{1}{2}\cdot\frac{4}{5}=2,6\)
\(\frac{1}{2}x-\frac{2}{5}=2,6-\frac{1}{4}\)
\(\frac{1}{2}x=2,35+\frac{2}{5}\)
\(\frac{1}{2}x=2,75\)
\(x=2,75:\frac{1}{2}=5,5\)
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a) \(12,5.4-x=4,3+2,6.\)
\(\Rightarrow12,5.4-x=6,9\)
\(\Rightarrow50-x=6,9\)
\(\Rightarrow x=50-6,9=43,1\)
b) \(\left(x+0,9\right).\left(1-0,4\right)=2412\)
\(\Rightarrow\left(x+0,9\right).0,6=2412\)
\(\Rightarrow x+0,9=2412:0,6=4020\)
\(\Rightarrow x=4020-0,9=4019,1\)
Ủng hộ mik nha!
10,4 - x = ( 19,8 - 2,6 ) : 4
=> 10,4 - x = 17,2 : 4
=> 10,4 - x = 4,3
=> x = 10,4 - 4,3
=> x = 6,1
10,4 - x = ( 19,8 - 2,6 ) : 4
=> 10,4 - x = 17,2 : 4
=> 10,4 - x = 4,3
=> x = 10,4 - 4,3
=> x = 6,1