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0,17 x 250 + 63 x 1,7 - 87 x 1,7
=1,7x25+ 63 x 1,7 - 87 x 1,7
=1,7x(25+63-87)
=1,7x1
=1,7
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{58x63}{42x87}=\frac{2x29x7x9}{6x7x3x29}=\frac{2x7x9x29}{2x7x3x3x29}=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1692,8:x=92\)
\(x=\frac{1692,8}{92}\)
\(x=18,4\)
vậy \(x=18,4\)
\(1087,5:x=87\)
\(x=\frac{1087,5}{87}\)
\(x=12,5\)
vậy \(x=12,5\)
Vũ Quế Anh Học giỏi
![](https://rs.olm.vn/images/avt/0.png?1311)
`a) 17,4×0,3+5,12:1,6`
`=5,22+3,2`
`=8,42`
`b) 87:6×(4,4+2,8)`
`=14,5×7,2`
`=104,4`
![](https://rs.olm.vn/images/avt/0.png?1311)
87-(321-x):5=75
=>87-(321-x) =75 x 5
=> 87-(321-x)= 375
=> 321-x=87-375
=> 321-x=.............
=> x=321- .........
tíc mình nha
87-(321-x)=75x5
87-321-xx=375
321-xx=375-87
321-xx=287
x = 321-287
x=34
![](https://rs.olm.vn/images/avt/0.png?1311)
2,9 x 87 + 2,9 x 10 + 2,9+2,9+2,9
=2,9x87+2,9x10+2,9x3
=2,9x(87+10+3)
=2,9x00
=290
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2 x 53 x 12 + 4 x 6 x 87 - 3 x 8 x 40
= 24 x 53 + 24 x 87 - 24 x 40
= 24 x ( 53 + 87 - 40 )
= 24 x 100
= 2400
2 x 53 x 12 + 4 x 6 x 87 - 3 x 8 x 40
= ( 2 x 12 ) x 53 + ( 4 x 6 ) x 87 - ( 3 x 8 ) x 40
= 24 x 53 + 24 x 87 - 24 x 40
= 24 x ( 53 + 87 - 40 )
= 24 x 100
= 2400
![](https://rs.olm.vn/images/avt/0.png?1311)
x : 4 = 675
x = 675 * 4
x = 2700
x : 3 = 27
x= 27 * 3
x = 81
x * 2 = 7890
x = 7890 : 2
x = 3945
x : 4 = 675
=> x = 675 x 4 = 2700
x : 3 = 87
=> x = 87 x 3 = 261
x * 2 = 7890
=> x = 7890 : 2 = 3945
![](https://rs.olm.vn/images/avt/0.png?1311)
x-32,5=31,32:87
=> x-32,5=0,36
=> x =0,36+32,5
=> x =32,86
90,4x1,6 +159,17:3,79
=>144,64+\(\dfrac{15917}{379}\)
=>186,63....