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![](https://rs.olm.vn/images/avt/0.png?1311)
`x : 5/2 = 7/3`
`=> x= 7/3 xx 5/2`
`=>x= 35/6`
__
`23,7 xx 49 +23,7 xx 51`
`= 23,7 xx (49+51)`
`= 23,7 xx 100`
`=2370`
Lời giải:
a.
$x=\frac{7}{3}\times \frac{5}{2}=\frac{35}{6}$
b.
$23,7\times 49+23,7\times 51=23,7\times (49+51)=23,7\times 100=2370$
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5\dfrac{3}{4}:3+2\dfrac{1}{4}\times\dfrac{1}{3}-\dfrac{1}{8}=\left(5\dfrac{3}{4}+2\dfrac{1}{4}\right)\times\dfrac{1}{3}-\dfrac{1}{8}\\ =8\times\dfrac{1}{3}-\dfrac{1}{8}=\dfrac{8}{3}-\dfrac{1}{8}=\dfrac{61}{24}\\ ----\\ \dfrac{3}{5}:\dfrac{5}{6}:\dfrac{6}{7}:\dfrac{7}{8}+\dfrac{2}{5}+\dfrac{23}{35}\\ =\dfrac{3}{5}\times\dfrac{6}{5}\times\dfrac{7}{6}\times\dfrac{8}{7}+\dfrac{2}{5}+\dfrac{23}{35}=\dfrac{18}{25}\times\dfrac{4}{3}+\dfrac{2}{5}+\dfrac{23}{35}=\dfrac{353}{175}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 20,33 + 35,12) x 33 – 45,45 x 23 – 10 x 23
= 55,45 x 33 - (45,45 + 10) x 23
= 55,45 x 33 - 55,45 x 77
= 55,45 x ( 33 - 23)
= 55, 45 x 10 = 554,5
![](https://rs.olm.vn/images/avt/0.png?1311)
( 20,33 + 35,12) x 33 – 45,45 x 23 – 10 x 23
= 55,45 x 33-(45,45 + 10) x 23
= 55,45x 33-55,45 x 77
= 55,45 x ( 33 - 23)
= 55, 45 x 10
= 554,5
![](https://rs.olm.vn/images/avt/0.png?1311)
7,2 x 2,8 + 7,3 x 7,2 = 7,3 x (2,8 + 7,2)
= 7,3 x 10 = 73
54,57 x 83 - 54,57 x 23 = 54,57 x (83 - 23)
= 54,57 x 60 = 3274,2
1/2 x 45 + 0,5 x 37 + 5/10 x 18
= 0,5 x 45 + 0,5 x 37 + 0,5 x 18
= 0,5 x (45 + 37 + 18 )
= 0,5 x 100 = 50
0,125 x 4 x 784 x 8
= (0,125 x 8) x ( 4 x 784)
= 1 x 3136 = 3136
7,2 x 2,8 + 7,3 x 7,2
=7,2x(2,8+7,3)
=7,2x10,1
=72,72
54,57 x 83 - 54,57 x 23
=54,57 x (83-23)
=54,57 x 60
=3274,2
1/2 x 45 + 0,5 x 37 + 5/10 x 18
=1/2 x 45+1/2 x 37+1/2 x 18
=1/2 x (45+37+18)
=1/2 x 100
=50
0, 125 x 4 x 784 x 8
=(0,125 x 8) x (784 x 4)
=1 x 3136
=3136
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính bằng cách thuận tiện
23 x 4,2 + 23 x 4,5
= 23 x ( 4.2 + 4.5 )
= 23 x 8.7
= 200.1
L I K E mk nhé Khổng Thị Huệ
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
$=27\times 2+12,44\times 4+17,56\times 4+23\times 2$
$=2\times (27+23)+4\times (12,44+17,56)$
$=2\times 50+4\times 30$
$=100+120=220$
![](https://rs.olm.vn/images/avt/0.png?1311)
( 54 x 15 ) :9
=54:9x15
=90
( 56 x 23 x 4 ) :7
=56:7x23x4
=8x23x4
=32x23
=736
![](https://rs.olm.vn/images/avt/0.png?1311)
b) = ( 675,98 x 0,01 ) + ( 888,66 + 111,34 ) x 0,01
= 6,7598 + 10
= 16,7598
\(\dfrac{1}{2}\) xy=\(\dfrac{17}{42}\)
=\(\dfrac{17}{42}\):\(\dfrac{1}{2}\)
= \(\dfrac{34}{42}\)