2)

a)-18-x=30\(\Rightarrow\)x=-18-30=-48

b)-25+x=-2+9\(\Rightarrow\)-25+x=7\(\Rightarrow\)x=7-(-25)=7+25=32

c)-45-(x-1)=56\(\Rightarrow\)x-1=-45-56=-101\(\Rightarrow\)x=-101+1=-100

73+36+968+914+3032

=73+(36+914)+(968+3032)

=73+950+4000

=5023

1) ( mk khong viet lai de dau nhe! )

a)= 73 + ( 36 + 914 ) + ( 968 + 3032 )

= 73 + 950 + 4000

= 1023 + 4000

= 5023

b)=314 x ( 67 + 16) + 659 x 83

= 314 x 83 + 659 x 83

= ( 314 + 659 ) x 83

= 973 x 83

= 80759

1) 73+36+968+914+3032

=(36+914)+(968+3032)+73

=950+4000+73

=5023

 341×67+341×16+659×83

=341×(67+16)+659×83

=341×83+659×83

=(341+659)×83

=1000×83

=83000

2)3636÷(12×x-91)=36

<=>12×x-91=3636÷36

<=>12×x-91=101

<=>12×x=101+91

<=>12×x=192

<=>x=192÷12

<=>x=16

Vậy x=16

(x÷23+45)×67=8911

<=>x÷23+45=8911÷67

<=>x÷23+45=133

<=>x÷23=133-45

<=>x÷23=88

<=>x=2024

Vậy x= 2024

(x-7/8)-15/64=3/4

<=>x-7/8=3/4+15/64

<=>x-7/8=63/64

<=>x=63/64+7/8

<=>x=119/64

Vậy x=119/64

Hok tốt 

k mk nha

quy đồng 55/8=495/72

              64/9=512/72

các số trên là 496,497,498,...,511

sai rồi ngọc tôn nữ

\(a,\Rightarrow12x-91=101\\ \Rightarrow12x=192\\ \Rightarrow x=16\\ b,\Rightarrow x:23+45=133\\ \Rightarrow x:23=88\\ \Rightarrow x=\dfrac{88}{23}\\ c,\Rightarrow\left(6x-39\right):7=3\\ \Rightarrow6x-39=21\\ \Rightarrow6x=60\\ \Rightarrow x=10\\ d,\Rightarrow3x-24=\dfrac{148}{73}\\ \Rightarrow3x=\dfrac{1900}{73}\\ \Rightarrow x=\dfrac{1900}{219}\\ e,\Rightarrow\left[{}\begin{matrix}x=0\\x=10\end{matrix}\right.\\ f,\Rightarrow\left[{}\begin{matrix}x=-1\\x=2\end{matrix}\right.\\ d,\left(9-x\right)^3=64=4^3\\ \Rightarrow9-x=4\\ \Rightarrow x=5\\ h,\Rightarrow x=27\\ i,\Rightarrow6x=312\cdot12=624\cdot6\\ \Rightarrow x=624\\ j,\Rightarrow\left(19x+104\right):14=25-42=-17\\ \Rightarrow19x+104=-238\\ \Rightarrow19x=-342\\ \Rightarrow x=-18\)

a. 3636 : (12x - 91) = 36

=> 12x - 91 = 3636 : 36

=> 12x - 91 = 101

=> 12x = 101 + 91

=> 12x = 192

=> x = 192 : 12

=> x = 16

b. (x : 23 + 45). 67 = 8911

=> x : 23 + 45 = 8911 : 67

=> x : 23 + 45 = 133

=> x : 23 = 133 - 45

=> x : 23 = 88

=> x = 88 . 23

=> x = 2024

c. (19x + 2.5²) : 14 = (13 - 8)² - 4

=> (19x + 2.25) : 14 = 5² - 4

=> (19x + 50) : 14 = 25 - 4

=> (19x + 50) : 14 = 21

=> 19x + 50 = 21. 14

=> 19x + 50 = 294

=> 19x = 294 - 50

=> 19x = 244

=> x = 244 : 19

=> x = 244/19 (Xem lại đề)

d. -12 .(x - 5) + 7.(3 - x) = 5

=> -12x + 60 + 21 - 7x = 5

=> -19x + 81 = 5

=> -19x = 5 - 81

=> -19x = -76

=> x = -76 : (-19)

=> x = 4

3636:(12.x-76):4=36

Các bạn giúp với

Ta có:

\(\frac{55}{8}=6\frac{7}{8}\) < x < \(\frac{64}{9}=7\frac{1}{9}\)

=> 6 < \(6\frac{7}{8}\) < x = 7 < \(7\frac{1}{9}\)

Vậy x = 7.

Ta có : \(\frac{55}{8}=6\frac{7}{8}\); \(\frac{64}{9}=7\frac{1}{9}\) => x = 7

Số tự nhiên x là 7 nhé !

Tìm số tự nhiên x biết 55/8 < x < 64/9

a)15/8+3/4-5/12

=45+18-10/24

=53/24

b)11/24.12/33+5/6

=11.12/12.2.11.3+5/6

=1/6+5/6

=6/6=1

c)15/8+7/24:5/8

=15/8+7/24.8/5

=15/8+7.8/3.8.5

=15/8+7/15

=đề sai, nếu đúng thì như này

=8/15+7/15

=15/15=1

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