`a, 18(x-16)=-36`

`=>x-16=-36:18`

`=>x-16=-2`

`=>x=-2+16`

`=>x= 14`

`b,(-12-x):(-5)=3`

`=>-12-x=3 . (-5)`

`=>-12-x=-15`

`=>x= -12-(-15)`

`=>x=-12+15`

`=>x= 3`

`c,11-(-53+x)=97`

`=>-53+x=11-97`

`=>-53+x=-86`

`=>x=-86-(-53)`

`=>x=-86+53`

`=>x= -33`

`d,-9.x+(-7).x=-48`

`=> [-9+(-7) ].x=-48`

`=>-16.x=-48`

`=>x=-48:(-16)`

`=>x= 3`

`e,(2x-1)^3=-27`

`=> (2x-1)^3=-3^3`

`=> 2x-1=-3`

`=>2x=-3+1`

`=>2x=-2`

`=>x=-2:2`

`=>x=-1`

bn tách ra nhé!

Bài 5 :

\(a,5x-16=40+x\)

\(\Leftrightarrow5x-x=40+16\)

\(\Leftrightarrow4x=56\)

\(\Leftrightarrow x=14\)

\(b,-41+2x-\left(-24\right)=4x-23-x\)

\(\Leftrightarrow-41+2x+24=4x-23-x\)

\(\Leftrightarrow2x-4x+x=41-24-23\)

\(\Leftrightarrow-x=-6\)

\(\Leftrightarrow x=6\)

\(c,2\left(x-5\right)-\left(x+6\right)=\left(-7\right)^2\)

\(\Leftrightarrow2x-10-x-6=49\)

\(\Leftrightarrow x=65\)

\(d,120-4\left(1-x\right)=106-3x\)

\(\Leftrightarrow120-4+4x=106-3x\)

\(\Leftrightarrow4x+3x=106-120+4\)

\(\Leftrightarrow7x=-10\)

\(\Leftrightarrow x=-\dfrac{10}{7}\)

3⁸ + 4⁸ + 5⁸ + ... + 800⁸ (cùng số mũ)

⇒ (3.4.5.6.7......800)⁸

Phép này chỉ làm được đến đây thôi, chứ nhân thì ra số dài lắm bạn.

\(1440:\left[41-\left(2x-5\right)\right]=2^4.3\)

\(\Rightarrow1440:\left[41-\left(2x-5\right)\right]=48\)

\(\Rightarrow41-\left(2x-5\right)=30\)

\(\Rightarrow2x-5=11\)

\(\Rightarrow2x=16\)

\(\Rightarrow x=8\)

Vậy \(x=8\)

\(1440:\left[41-\left(2x-5\right)\right]=2^4\cdot3\)

\(1440:\left[41-\left(2x-5\right)\right]=48\)

\(41-\left(2x-5\right)=\frac{1440}{48}=30\)

\(2x-5=41-30=11\)

\(2x=16\)

\(x=8\)

1)\(\dfrac{2}{9}+\dfrac{-3}{4}+\dfrac{5}{30}\)

\(=\dfrac{2.20}{9.20}+\dfrac{-3.45}{4.45}+\dfrac{5.6}{30.6}\)

\(=\dfrac{40}{180}+\dfrac{-135}{180}+\dfrac{30}{180}\)

\(=\dfrac{40+\left(-135\right)+30}{180}\)

\(=\dfrac{-65}{180}\)

\(=\dfrac{-13}{36}\)

2)\(\dfrac{-7}{12}-\dfrac{11}{18}\)

\(=\dfrac{-7.3}{12.3}-\dfrac{11.2}{18.2}\)

\(=\dfrac{-21}{36}-\dfrac{22}{36}\)

\(=\dfrac{-21-22}{36}\)

\(=\dfrac{-43}{36}\)

3)\(\dfrac{7}{8}-\dfrac{-5}{16}\)

\(=\dfrac{7.2}{8.2}-\dfrac{-5}{16}\)

\(=\dfrac{14}{16}-\dfrac{-5}{16}\)

\(=\dfrac{14-\left(-5\right)}{16}\)

\(=\dfrac{19}{16}\)

4)\(\dfrac{3}{8}-\dfrac{-9}{10}-\dfrac{5}{16}\)

\(=\dfrac{3.10}{8.10}-\dfrac{-9.8}{10.8}-\dfrac{5.5}{16.5}\)

\(=\dfrac{30}{80}-\dfrac{-72}{80}-\dfrac{25}{80}\)

\(=\dfrac{30-\left(-72\right)-25}{80}\)

\(=\dfrac{77}{80}\)

1)` 2/9 + -3/4 + 5/30= (40+(-135) + 30 )/180 = -65/180 = -13/36`

2) `-7/12 - 11/18=(-21)/36 - 22/36 = -43/36 `

3) `7/8 - (-5)/16=14/16- (-5)/16 = 19/16 `

4) `3/8 - (-9)/10 - 5/16= (30- (-72) -25)/80=77/80`

\(1005.2016:2.\frac{1}{1000}.\frac{25}{12}=2110,5\)

k minh minh giai

* (-6 - 2) . (-6 + 2)

=    -8   .     -4

=           32

*(7 . 3 - 3) : (-6)

=      18    : (-6)

=            -3

k cho mik nhe

Bài 2: 

Ta có: \(16x+40=10\cdot3^2+5\left(1+2+3\right)\)

\(\Leftrightarrow16x+40=90+30\)

\(\Leftrightarrow16x=80\)

hay x=5

Bài 1 :

[( 35 - 5 ) : 3 ]³ + 3

= [30 : 3]³ + 3

= 10³ + 3

= 1000 + 3

= 1003

Đây nha bạn!!!

Chúc bạn học tốt!!!