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2125 : X - 125 : X = 100
<=> ( 2125 - 125 ) : X = 100
<=> 2000 : X = 100
=> X = 2000 : 100
X = 20
2125:X-125:X
=>(2125-125):X=100
=>2000:X =100
=>X =2000:100
=>x =20
125 . x - x . 47 = 25350
x . ( 125 - 47 ) = 25350
78x = 25350
=> x = 325
3 11 × 2 = 6 11 6 11 : 3 11 = 6 11 × 11 3 = 66 33 = 2 6 11 : 2 = 3 11 2 × 3 11 = 6 11
289 x 57 + 311 x 45 + 289 x 43 + 311 x 55
= 289 x ( 57 + 43 ) + 311 x ( 45 + 55 )
= 289 x 100 + 311 x 100
= ( 289 + 311 ) x 100
= 600 x 100
= 60000
\(289x57+311x45+289x43+311x55\)\(=289x\left(57+43\right)+311x\left(45+55\right)\)
\(=289x100+311x100=100x\left(289+311\right)\)\(=100x600=60000\)
a (X:10)+37=60
X:10=23
X=2,3
b 25xX-15xX=72
X(x25-15)=72
Xx10=72
X=7,2
c 138-(Xx5)=38
Xx5=100
X=20
d (Xx9):52=18
Xx9=936
X=104
e 52xX+48xX=100
Xx(52+48)=100
Xx100=100
X=1
f 623xX-123xX=1000
Xx(623-123)=1000
Xx500=1000
X=2
g Xx16+84xX=700
Xx(16+84)=700
Xx100=700
X=7
h 236xX-Xx36=2000
Xx(236-26)=2000
Xx200=2000
X=10
i 216:X+34:X=10
(216+34):X=10
250:X=10
X=25
f 2125:X-125:X=100
(2125-125):X=100
2000:X=100
X=20
\(\left(\frac{11}{5}\div\frac{5}{25}\right)\times\frac{3}{11}\)
\(=\left(\frac{11}{5}\div\frac{1}{5}\right)\times\frac{3}{11}\)
\(=\frac{55}{5}\times\frac{3}{11}\)
\(=11\times\frac{3}{11}\)
\(=\frac{121}{11}\times\frac{3}{11}\)
\(=\frac{363}{121}\)
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