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a) \(\frac{2}{5}\)+ X = \(\frac{13}{15}\) - \(\frac{1}{3}\)
\(\frac{2}{5}+X=\frac{8}{15}\)
\(X=\frac{8}{15}-\frac{2}{5}\)
\(X=\frac{2}{15}\)
a) 2/5 + x = 13/15 - 1/3
2/5 + x = 8/15
x = 8/15 - 2/5
x = 2/15
b) x - 2/9 = 2/3 x 2
x - 2/9 = 4/3
x = 4/3 + 2/9
x = 14/9
a) ( 72 - 8 x 9 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )
= ( 72 - 72 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )
= 0 : ( 20 + 21 + 22 + 23 + 24 + 25 )
= 0
b) ( 500 x 9 - 250 x 18 ) x ( 1 + 2 + 3 + ... + 9 )
= ( 500 x 9 - 250 x 2 x 9 ) x ( 1 + 2 + 3 + ... + 9 )
= ( 500 x 9 - 500 x 9 ) x ( 1 + 2 + 3 + ... + 9 )
= 0 x ( 1 + 2 + 3 + ... + 9 )
= 0
a)=1/2*2/3......*19/20
=1/20
b)=3/2*4/3......*2008/2007
=3/2007
(x+1)+(x+2)+(x+3)+(x+4)=110
(x+x+x+x)+(1+2+3+4)=110
4x+10=110
4x=110-10
4x=100
x=100:4
x=25
[ x + 1 ] + [ x + 2 ] + [ x + 3 ] + [ x + 4 ] = 110
=> x + 1 + x + 2 + x + 3 + x + 4 = 110
=> ( x + x + x + x ) + ( 1 + 2 + 3 + 4 ) = 110
=> 4x + 10 = 110
=> 4x = 100
=> x = 25
Vì số 18 chia hết cho 9 nên 3*91000 sẽ chia hết cho 9 hay : 3 + * + 9 + 1 + 0 + 0 + 0 chia hết cho 9
Suy ra : 3 + * + 9 + 1 + 0 + 0 + 0 = 18
13 + * = 18
* = 18 - 13
* = 5
Nhớ cho mình nhé
a) \(x:\frac{1}{2}+\frac{3}{4}=1\frac{19}{20}\)
\(x:\frac{1}{2}+\frac{3}{4}=\frac{39}{20}\)
\(x:\frac{1}{2}=\frac{39}{20}-\frac{3}{4}\)
\(x:\frac{1}{2}=\frac{39}{20}-\frac{15}{20}\)
\(x:\frac{1}{2}=\frac{24}{20}\)
\(x=\frac{24}{20}.\frac{1}{2}\)
\(x=\frac{3}{5}\)
\(x:\frac{1}{2}+\frac{3}{4}=1\frac{19}{20}\)
\(x:\frac{1}{2}=1\frac{19}{20}-\frac{3}{4}\)
\(x:\frac{1}{2}=\frac{39}{20}-\frac{3}{4}\)
\(x:\frac{1}{2}=\frac{39}{20}-\frac{15}{20}\)
\(x:\frac{1}{2}=\frac{24}{20}\)
\(x=\frac{24}{20}\times\frac{1}{2}\)
\(x=\frac{24}{40}\)
\(x=\frac{3}{5}\)