100:[3.x-2]=25
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\(\dfrac{1}{4}.\dfrac{2}{3}=\dfrac{2}{12}=\dfrac{1}{6}\)
25/100 x 2/3
= 25 x 2 / 100 x 3
= 2 / 4 x 3
= 2 / 12
= 1/6
bạn chọn đáp án c.12
x/100=3/25
vì x =12 vì : 4 =3
vì 100 : 4 = 25
Lời giải:
$\frac{x}{100}=\frac{3}{25}$
$x=\frac{3}{25}\times 100=12$
Đáp án C.
Bài làm:
(2019-2018+2017-.....-2) x (100 -25x2x2)
=(2019-2018+2017-.....-2) x (100 -25x4)
=(2019-2018+2017-.....-2) x 0
=0
*like phát
=(2019 – 2018 + 2017 – 2016 + 2015 + ....... – 4 + 3 – 2) x(100-25x4)
=(2019 – 2018 + 2017 – 2016 + 2015 + ....... – 4 + 3 – 2) x(100-100)
=(2019 – 2018 + 2017 – 2016 + 2015 + ....... – 4 + 3 – 2) x0
=0
11/15 + 8/5= Tính phân số
6/7 - 5/21=
25/4 x 16/100
7 x 2/49 =
4/3 : 2/9
5/8 : 25 =
b)
`15-3(3x+18)=36`
`=> 3(3x+18)=15-36`
`=> 3(3x+18)=-21`
`=> 3x+18=-21:3`
`=> 3x+18=-7`
`=> 3x=-7-18`
`=> 3x=-25`
`=> x=-25:3`
`=> x=-25/3`
c)
`-12+(3-x)=25`
`=>-12+3-x=25`
`=>-x=25+12-3`
`=>-x=34`
`=>x=-34`
d)
`100-90xx(x:2-1)=-10`
`=>90xx(x:2-1)=100-(-10)`
`=>90xx(x:2-1)=110`
`=>x:2-1=110:90`
`=>x:2-1=11/9`
`=>x:2=11/9 +1`
`=> x:2=20/9`
`=> x=20/9 xx2`
`=> x=40/9`
10 x 45 - 25 x 10
= 10 x ( 45 - 25 )
= 10 x 20
= 200
100 x 2 + 100 x 3
= 100 x ( 2 + 3 )
= 100 x 5
= 500
10 x 45 - 25 x 10
= 10 x [45 - 25]
= 10 x 20
= 200
100 x 2 + 100 x 3
= 100 x [2 + 3]
= 100 x 5
= 500
(160 x 25 - 80 x 50) x (1+2+3+.....+100) = (160 x 25 - 160 x 25) x (1 + 2 + ........+ 100)
= 0 x (1+2+3+.......+100) = 0
Bài 4 : Tính nhanh :
a, 15. 64 + 25. 100 + 36. 15 + 60. 100
= (15 . 64 + 36. 15) + (25. 100 + 60. 100)
= 15.(64 + 36) + 100.(25 + 60)
= 15. 100 + 100. 85
= 100.(15 + 85)
= 100. 100
= 10000
b, 472 + 482 - 25 + 94. 48
= 472 + 2.47. 48 + 482 - 25
= (47 + 48)2 - 52
= (47 + 48 - 5)(47 + 48 + 5)
= (48 + 22)(48 + 52)
= 90. 100
= 9000
c, 93 - 92. ( -1) - 9. 11 + ( -1). 11
= 93 + 92 + 11(- 9 - 1)
= 92.(9 + 1) + 11. (-10)
= 81. 10 - 110
= 810 - 110
= 700
d,2016. 2018 - 20172
= (2017 - 1)(2017 + 1) - 20172
= 20172 - 1 - 20172
= -1
#Học tốt!
b: \(\Leftrightarrow\left(\dfrac{29-x}{21}+1\right)+\left(\dfrac{27-x}{23}+1\right)+\left(\dfrac{25-x}{25}+1\right)+\left(\dfrac{23-x}{27}+1\right)+\left(\dfrac{21-x}{29}+1\right)=0\)
=>50-x=0
hay x=50
c: \(\Leftrightarrow\dfrac{x-2}{2001}+1=\dfrac{x-1}{2002}+\dfrac{x}{2003}\)
\(\Leftrightarrow\left(\dfrac{x-2}{2001}-1\right)=\left(\dfrac{x-1}{2002}-1\right)+\left(\dfrac{x}{2003}-1\right)\)
=>x-2003=0
hay x=2003
100:[3.x-2]=25
3.x-2 = 100 : 25
3.x-2 = 4
3.x = 4+2
3.x = 6
x = 6:3=2
vậy x = 2