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\(\dfrac{3}{4}\cdot\dfrac{2}{5}+\dfrac{3}{4}\cdot\dfrac{2}{5}\)
\(=\dfrac{3}{4}\cdot\dfrac{2}{5}\left(1+1\right)\)
\(=\dfrac{6}{20}\cdot2\)
\(=\dfrac{12}{20}=\dfrac{3}{5}\)
\(\dfrac{7}{16}+\dfrac{5}{8}x\dfrac{4}{10}=\dfrac{7}{16}+\dfrac{1}{4}=\dfrac{11}{16}\)
a) 4/9 x ( 3/5 + 8/5 - 2/10 )
= 4/9 x 1
=4/9
b) ( 312 + 325 - 247 ) : 13
= 390 : 13
= 30
a: =1/2(3/4+1)=1/2x7/4=7/8
b: =9/8-1/6=27/24-4/24=23/24
`x xx 2 +x/2=10`
`=> x xx 2+ x xx 1/2 =10`
`=> x xx (2+1/2) =10`
`=> x xx ( 4/2 +1/2) =10`
`=> x xx 5/2 =10`
`=> x=10:5/2`
`=> x= 10 xx 2/5`
`=> x= 20/5`
`=>x=4`
Vậy `x=4`
a\()\) 1/2 x 2/3 : 5/6 x 5/6
=2/6 : 35/36
=1/3 x 36/35
=36/105=12/35
b\()\)11x15x56/6x35x38
=165x56/6x35x38
=9240/6x35x38
=1540x35x38
=53900x38
=2,048,200
c\()\) 2/7 x 7/5 + 2/7 - 2/7 x 6/5
=2/7x\(\left(\dfrac{7}{5}-\dfrac{2}{7}\right)\)+2/7
=2/7 x 39/35 + 2/7
=2/7 x \(\left(\dfrac{39}{35}+1\right)\)
=2/7 x 74
=148/7
\(\dfrac{9}{10}\times\left(\dfrac{11}{29}+\dfrac{2}{29}+\dfrac{16}{29}\right)=\dfrac{9}{10}\times\dfrac{29}{29}=\dfrac{9}{10}\times1=\dfrac{9}{10}\)
4<X x 2<10
4<3x2,4x2<10
HT :D
4 < X . 2 < 10
2 . 2 < X . 2 < 2 . 5
2 < X < 5
X = { 3 ; 4 }