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Khoang cach cua day so tren la 5
So cac so hang la:
[54-4]:5+1=11[so]
Tong day so tu 4 den 54 la
[54+4]x11:2=319
=>x x 11+319=1430
x x 11 =1430-319
x x 11 =1111
x =1111:11
x =101
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A = 7 x 17 x 27 x 37 x 47 x 57 - 4 x 14 x 24 x 34 x 54 x 64
A = \(\)(7 x 17 x 27 x 37) x (47 x 57 ) - (4 x 14) x (24 x 34) x (54 x 64)
A = \(\overline{..1}\) x \(\overline{..9}\) - \(\overline{..6}\) x \(\overline{..6}\) x \(\overline{..6}\)
A = \(\overline{..9}\) - \(\overline{..6}\)
A = \(\overline{..3}\)
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Tất cả dùng nhân chéo
a.3x=2.54=>x=36
b.15x=60=>x=4
c.2/3=4/6=>x=5
d.x=5;4(câu này ss từng phần)
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\(\frac{4}{5}+x=5\frac{14}{15}=\frac{89}{15}\)
\(\Leftrightarrow x=\frac{89}{15}-\frac{4}{5}=\frac{77}{15}\)
_Kudo_
\(\frac{\left(15+x\right)}{37}=\frac{54}{14}\)
\(\Rightarrow\) \(\left(15+x\right)×14=37×54\)
\(\left(15+x\right)×14=1998\)
\(15+x=1998\div14\)
\(15+x=\frac{999}{7}\)
\(x=\frac{999}{7}-15\)
\(x=\frac{999}{7}-\frac{105}{7}\)
\(x=\frac{894}{7}\)
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