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\(\left(5+\frac{4}{7}\right):x=13\)
\(\frac{39}{7}:x=13\)
\(x=\frac{39}{7}:13\)
\(x=\frac{3}{7}\)
\(\left[5+\frac{4}{7}\right]:x=13\)
\(\Rightarrow\left[\frac{5\cdot7+4}{7}\right]:x=13\)
\(\Rightarrow\frac{39}{7}:x=13\)
\(\Rightarrow x=\frac{39}{7}:13=\frac{39}{7}\cdot\frac{1}{13}=\frac{3}{7}\cdot\frac{1}{1}=\frac{3}{7}\)
\(\left[2,8\cdot x+32\right]:\frac{2}{3}=90\)
\(\Rightarrow\left[2,8\cdot x+32\right]=90\cdot\frac{2}{3}\)
\(\Rightarrow\left[2,8\cdot x+32\right]=60\)
\(\Rightarrow2,8\cdot x+32=60\)
\(\Rightarrow2,8\cdot x=60-32\)
\(\Rightarrow2,8\cdot x=28\)
Đến đây dễ rồi :v
Tìm x thuộc N biết:
X+245=43×11
=>x+245=473
=>x=228
X-382=159:3
=>x-382=53
=>x=53+382=438
7×X+2×X=918
=>(7+2).x=918
=>9x=918
=>x=918:9=102
3×(X-2)+150=240
=>3.(x-2)=240-150
=>3.(x-2)=90
=>x-2=90:3=30
=>x=30+2=32
(X+13):5=12
=>(x+13)=12.5
=>x+13=60
=>x=60-13
=>x=47
Bấm **** nha
360:(X-7)=90
X+245=43*11
X+245=473
x=473-245
X=228
X-382=159:3
X-382=53
X=382+53
X=435
7*X+2*X=918
(7+2)*X=918
9*X=918
X=918:9
X=102
3*(X-2)+150=240
3*(X-2)=240-150
3*(X-2)=90
X-2=90:3
X-2=30
X=30-2
X=28
(X+13):5=12
X+13=12*5
X+13=60
X=60-13
X=47
360:(X-7)=90
X-7=360:90
X-7=4
X=7+4
X=11
7.x + 2.x = 927
\(\Leftrightarrow\)( 7 + 2).x =927
\(\Leftrightarrow\)9.x = 927
\(\Leftrightarrow\)x = 927 : 9
\(\Leftrightarrow\)x = 103
Vậy x = 103
3(x-2)+150=240
\(\Leftrightarrow\)3(x-2)=240-150
\(\Leftrightarrow\)3(x-2)=90
\(\Leftrightarrow\)x-2=90:3
\(\Leftrightarrow\)x-2=30
\(\Leftrightarrow\)x=30+2
\(\Leftrightarrow\)x=32
Vậy x=32
( x + 13 ) : 5 = 120
\(\Leftrightarrow\)x + 13 = 120 \(\times\)5
\(\Leftrightarrow\)x + 13 = 600
\(\Leftrightarrow\)x = 600 - 13
\(\Leftrightarrow\)x = 587
Vậy x = 587
360:(x-7)=90
\(\Leftrightarrow\)x-7=360:90
\(\Leftrightarrow\)x-7=40
\(\Leftrightarrow\)x=40+7
\(\Leftrightarrow\)x=47
Vậy x=47
7.x + 2.x = 927
x.(7 + 2) = 927
x.9 = 927
x = 927 : 9
x = 103
Vậy x = 103
3(x - 2) + 150 = 240
3(x - 2) = 240 - 150
3.(x - 2) = 90
x - 2 = 90 : 3 = 30
x = 30 + 2 = 32
Vậy x = 32
(x + 13) : 5 = 120
x + 13 = 120 x 5 = 600
x = 600 - 13 = 587
Vậy x = 587
360:(x - 7) = 90
x - 7 = 360 : 90 = 4
x = 4 + 7 = 11
Vậy x = 11
Ủng hộ mk nha !!! ^_^
1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
`1, -2/9 xx 15/17 + (-2/9) xx 2/17`
`= -2/9 xx (15/17 + 2/17)`
`= -2/9 xx 17/17`
`=-2/9xx1`
`=-2/9`
__
`-5/3 xx 6/5 + (-7/9) xx 3/10`
`= -30/15 + (-21/90)`
`= -2 + (-7/30)`
`=-60/30 +(-7/30)`
`=-67/30`
__
`15/20 xx 7/5 + (-9/7) xx (-6/4)`
`=3/4 xx7/5 + (-9/7) xx(-6/4)`
`= 21/20 + 54/28`
`= 21/20 + 27/14`
`=417/140`
__
`-25/13 xx 5/19 + (-25/13) xx 14/19`
`=-25/13 xx (5/19 +14/19)`
`=-25/13 xx 19/19`
`= -25/13 xx 1`
`=-25/13`
__
`-7/13 xx 13/5 + (-9/7) xx 5/3`
`=-7/5 +(-15/7)`
`=-124/35`
360 : (x-7 ) = 90
( x - 7 ) = 360 : 90
x - 7 = 4
x = 4 + 7
x = 11