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![](https://rs.olm.vn/images/avt/0.png?1311)
1,x=2135
2,x=3156
3,x=5126
4,x=1797
5,x=134
6,x=767
7,x=39396
8,x=170
hok tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x+678=2813
=>x=2813-678
=>x=2145
x x 23=3082
=>x= 3082:23
=>x=134
a. ( x + 268 ) x 137 = 48498
( x + 268 ) = 48498 / 137
x + 268 = 354
x = 354 - 268
x = 86
![](https://rs.olm.vn/images/avt/0.png?1311)
2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3
= 24 x 31 + 24 x 42 + 24 x 27
= 24 x ( 31 + 42 + 27 )
= 24 x 100
= 2400
![](https://rs.olm.vn/images/avt/0.png?1311)
mk chi chep thua so thu 3 thoi nhe con 2 thua so con lai giu nguyen
42/30.75/23-19/23.210/38
=7/5.75.1/23-1/23.19.210/38
=7.15.1/23-1/23.210/2
=105.1/23-1/23.105=0
gia tri bieu thuc=0
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x+x\cdot3:\dfrac{2}{9}+x:\dfrac{2}{7}=252\)
\(\Leftrightarrow x+x\cdot3\cdot\dfrac{9}{2}+x\cdot\dfrac{7}{2}=252\)
\(\Leftrightarrow x\cdot18=252\)
hay x=14
![](https://rs.olm.vn/images/avt/0.png?1311)
5647x 5566 = 31431202
456x 1800 = 820800
4768x 30 = 143040
6788x 56 = 380128
5647 x 5566 = 31431202
456 x 1800 = 820800
4768 x 30 = 143040
6788 x 56 = 380128
![](https://rs.olm.vn/images/avt/0.png?1311)
147 -( x x 36) = 29
X x 36 = 147 - 29
X x 36 = 118
X = 118 : 36
X = ...
Chúc bạn hok tốt
oki
147- ( X x 36 ) =29
X x 36=147 - 29
X x 36 =118
X =118 : 36
X = .....
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
a, \(\dfrac{5}{23}\) \(\times\) \(\dfrac{17}{26}\) + \(\dfrac{5}{23}\) \(\times\) \(\dfrac{9}{26}\)
= \(\dfrac{5}{23}\) \(\times\) ( \(\dfrac{17}{26}\) + \(\dfrac{9}{26}\))
= \(\dfrac{5}{23}\) \(\times\) \(\dfrac{26}{26}\)
= \(\dfrac{5}{23}\)
b, \(\dfrac{3}{4}\) \(\times\) \(\dfrac{7}{9}\) + \(\dfrac{7}{4}\) \(\times\) \(\dfrac{3}{9}\)
= \(\dfrac{7}{12}\) + \(\dfrac{7}{12}\)
= \(\dfrac{14}{12}\)
= \(\dfrac{7}{6}\)
x+678=2813 4529+x=7685 x-358=4768 2459-x=698
x =2813-678 x =7685-4529 x =4768+358 x =2459-698
x =2135 x =3158 x =5128 x =1761
X x 23 = 3082 36 x X =27612 x : 42 =938 4080 : x=24
x =3082 : 23 x =27612 : 36 x =938 x 42 x =4080 :24
x =134 x =767 x =39396 x =170
kick mik nha bạn
x+678=2813
=>x=2813-678
=>x=2135
4529+x=7685
=>x=7685-4529
=>x=3156