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2 : ( 2 + x ) - 11 = 6 : 3 + 7 x 5
2 : ( 2 + x ) - 11 = 37
2 : ( 2 + x ) = 26
2 : x = 24
x = \(\frac{1}{12}\)
2:(2+x)-11=6:3+7×5
2:(2+x)=2+7×5
2:(2+x)=2+35
2:(2+x)=37
(2+x)=37×2
(2+x)=74
x=74-2
x=72
vậy x=72
3/4+2/3+5/12=11/6
7/8-7/16-11/32=3/32
3/5*2/7*5/6=1/7
15/16:3/8:3/4=10/3
bạn nhé
Câu 1 :
4/7 . x - 2/3 = 1/5
4/7 . x = 1/5 + 2/3
4/7 . x = 13/15
x = 13/15 : 4/7
x = 91/60
Câu 2 :
2/3 + 1/3 : x = 1
1/3 : x = 1 - 2/3
1/3 : x = 1/3
x = 1/3 : 1/3
x = 1
Câu 3 :
x/5 - 5/6 = 11/30
x/5 = 11/30 + 5/6
x/5 = 6/5
=> x = 6
Câu 4 :
6/7 + 1/7 x 2/7 + 1/7 x 5/7
= 6/7 + 2/49 + 5/49
= 6/7 + 7/49
= 6/7 + 1/7
= 1
Câu 5 :
6/7 + 5/7 : 5 - 8/9
= 6/7 + 1/7 - 8/9
= 1 - 8/9
= 1/9
a) \(6x+15\times8=12\times\left(19-x\right)\)
\(6x+120=228-12x\)
\(6x+120-228+12x=0\)
\(18x-108=0\)
\(18x=108\)
\(x=6\)
b) \(160-\left(35\div x+3\right)\times15=15\)
\(160-\left(35\div x+3\right)=1\)
\(35\div x+3=159\)
\(35\div x=156\)
\(x=\dfrac{35}{156}\)
c) \(2x-\left(1309\div11-19\right)-2=0\)
\(2x-1309\div11-19=2\)
\(2x-119-19=2\)
\(2x-119=21\)
\(2x=140\)
\(x=70\)
d) \(\left(x-7\right)\times\left(2x-16\right)=0\)
\(x-7=0;2x-16=0\)
\(x=7;2x=16\)
\(x=7;x=8\)
a) 8x+2x = 25.22
8x+2x = 25. 4
8x+2x = 100
( 8 + 2) . x = 100
10 . x =100
x =100 :10
x =10
1, 2x - 35 = 15
2x = 15 + 35
2x = 50
x = 50 : 2
x = 25.
2, 3x + 18 = 12
3x = 12 - 18
3x = -6
x = -6 : 3
x = -2.
3, / x - 1 / = 0
=> x \(\in\varnothing\).
4, -13 /x/ = - 26
/x/ = -26 : -13
=> \(\orbr{\begin{cases}x=2\\x=-2\end{cases}}\)
Vậy x \(\in\){ 2 ; -2}.
5,4 - ( 27 - 3 ) = x - ( 13 - 4 )
4 - 24 = x - 9
-20 = x - 9
-x = 9 + 20
-x = 29
x = -29.
6, 47 - ( x + 15 ) = 21
47 - x - 15 = 21
-x - 15 = 21 - 47
-x - 15 = -26
-x = -26 + 15
-x = - 11
x = 11.
7, -5 -( 24 - x) = - 11
-5 - 24 + x = -11
-24 + x = -11 + 5
-24 + x = -6
x = -6 + 24
x = 18.
8, 6 - /x/ = 2
/x/ = 6 - 2
\(\orbr{\begin{cases}x=3\\x=-3\end{cases}}\)
Vậy x \(\in\left\{3;-3\right\}.\)
9, 6 + /x/ = 2
/x/ = 2 - 6
=> x = -4.
2x - 35 = 15
=> 2x = 15 + 35
=> x = 50 : 2
=> x = 25
3x + 18 = 12
=> 3x = 12 - 18
=> x = ( -6 ) : 3
=> x = -2
| x - 1 | = 0
=> x - 1 = 0
=> x = 0 + 1
=> x = 1
-13 * | x | = -26
=> | x | = -26 : ( -13 )
=> | x | = 2
a)=1x2x3x4x5/2x3x4x5x6 =1/6
b)=1x2x3x4x5x6x7x8x9/10x9x8x7x6x5x4x3 x2=1/10
2 x ( 2 + X ) - 11 = 6 : 3 + 7 x 5
2 x ( 2 + X ) - 11 = 2 + 35
2 x ( 2 + X ) - 11 = 37
2 x ( 2 + X ) = 37 + 11
2 x ( 2 + X ) = 48
2 + X = 48 : 2
2 + X = 24
X = 24 - 2
X = 22
Bài làm :
\(2\times\left(2+x\right)-11=6\div3+7\times5\)
\(\Leftrightarrow2\times2+2\times x=2+35+11\)
\(\Leftrightarrow4+2\times x=48\)
\(\Leftrightarrow2\times x=48-4=44\)
\(\Leftrightarrow x=44\div2=22\)
Vậy x=22
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