*) Tính:

a) 105

b) 73

c) 40

d) 27

e) 511

mn ơi giúp mik đi huhu

mn nêu cách làm ra giúp tớ nha

a)  80 - [ 130 - ( 12 - 4 )² }

  = 80 - ( 130 - 8² )

  = 80 - ( 130 - 64 )

  = 80 - 66

  = 14

b)  2⁴ - 50 : 25 + 13 . 7

  = 16 - 2 + 91

  = 14 + 91

  = 105

c)  2 . [ ( 195 + 35 : 7 ) : 8 + 195 ] - 400

  = 2 . [ ( 195 + 5 ) : 8 + 195 ] - 400

  = 2 . ( 200 : 8 + 195 ) - 400

  = 2 . ( 25 + 195 ) - 400

  = 2 . 220 - 400

  = 440 - 400

  = 40

d)  4 . { 3² [ ( 5² + 2³ ) : 11 ] - 26 } + 2010

  = 4 . { 9 . [ ( 25 + 8 ) : 11 ] - 26 } + 2010

  = 4 . [ 9 . ( 33 : 11 ) - 26 ] + 2010

  = 4 . ( 9 . 3 - 26 ) + 2010

  = 4 . ( 27 - 26 ) + 2010

  = 4 . 1 + 2010

  = 4 + 2010

  = 2014

bạn cứ tính theo thứ tự là đ,c từ từ tính ra, 0 khó đâu! mới nhìn thì thấy hơi rắc rối nhưng thiệt sự 0 khó gì đâu!

2. [(195 + 35: 7) : 8 + 195] - 400

=2.[(195 + 5) : 8 +195] - 400

=2.(200 : 8 + 195) - 400

=2.(25 + 195) - 400

=2.220-400

=440-400

=40

4.{3^2[(5^2 + 2^3) :11] -26} + 2010

=4.{3^2[(25 + 8) : 11] - 26 } +2010

=4.[3^2(33 :11)- 26] + 2010

=4.(3^2 . 3 - 26) + 2010

=4.(3²⁺¹ - 26) + 2010

=4.(3^3 - 26) + 2010

=4.(27-26) + 2010

=4.1+2010

=2014

Cách tính của minh hơi dài dòng một chút , xin lỗi bạn nha

  \(\dfrac{1}{2}+\dfrac{3}{4}-\left(\dfrac{3}{4}-\dfrac{4}{5}\right)\)

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

=\(\left(\dfrac{1}{2}+\dfrac{4}{5}\right)+\left(\dfrac{3}{4}-\dfrac{3}{4}\right)\) 

=\(\left(\dfrac{5}{10}+\dfrac{8}{10}\right)+0\)

=\(\dfrac{13}{10}\)

\(-\dfrac{7}{25}.\dfrac{11}{13}+\left(-\dfrac{7}{25}\right).\dfrac{2}{13}-\dfrac{18}{25}\)

=\(-\dfrac{7}{25}.\cdot\left(\dfrac{11}{13}+\dfrac{2}{13}\right)-\dfrac{18}{25}\) 

=\(-\dfrac{7}{25}.1-\dfrac{18}{25}\) 

=\(-\dfrac{7}{25}-\dfrac{18}{25}\) 

=\(-\dfrac{25}{25}\) = \(-1\)

a) \(\dfrac{2}{3}x-\dfrac{1}{2}=\dfrac{1}{10}\)

\(\dfrac{2}{3}x=\dfrac{1}{10}+\dfrac{1}{2}=\dfrac{3}{5}\)

\(x=\dfrac{3}{5}:\dfrac{2}{3}=\dfrac{9}{10}\)

b) \(\dfrac{39}{7}:x=13\)

\(x=\dfrac{\dfrac{39}{7}}{13}=\dfrac{3}{7}\)

c) \(\left(\dfrac{14}{5}x-50\right):\dfrac{2}{3}=51\)

\(\dfrac{14}{5}x-50=51\cdot\dfrac{2}{3}=34\)

\(\dfrac{14}{5}x=34+50=84\)

\(x=\dfrac{84}{\dfrac{14}{5}}=30\)

d) \(\left(x+\dfrac{1}{2}\right)\left(\dfrac{2}{3}-2x\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{2}=0\\\dfrac{2}{3}-2x=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=\dfrac{1}{3}\end{matrix}\right.\)

e) \(\dfrac{2}{3}x-\dfrac{1}{2}x=\dfrac{5}{12}\)

\(\dfrac{1}{6}x=\dfrac{5}{12}\)

\(x=\dfrac{5}{12}:\dfrac{1}{6}=\dfrac{5}{2}\)

g) \(\left(x\cdot\dfrac{44}{7}+\dfrac{3}{7}\right)\dfrac{11}{5}-\dfrac{3}{7}=-2\)

\(\left(x\cdot\dfrac{44}{7}+\dfrac{3}{7}\right)\cdot\dfrac{11}{5}=-2+\dfrac{3}{7}=-\dfrac{11}{7}\)

\(x\cdot\dfrac{44}{7}+\dfrac{3}{7}=-\dfrac{11}{7}:\dfrac{11}{5}=-\dfrac{5}{7}\)

\(\dfrac{44}{7}x=-\dfrac{5}{7}-\dfrac{3}{7}=-\dfrac{8}{7}\)

\(x=-\dfrac{8}{7}:\dfrac{44}{7}=-\dfrac{2}{11}\)

h) \(\dfrac{13}{4}x+\left(-\dfrac{7}{6}\right)x-\dfrac{5}{3}=\dfrac{5}{12}\)

\(\dfrac{25}{12}x-\dfrac{5}{3}=\dfrac{5}{12}\)

\(\dfrac{25}{12}x=\dfrac{5}{12}+\dfrac{5}{3}=\dfrac{25}{12}\)

\(x=1\)

Mỏi tay woa bn làm nốt nha!!

Mình lớp 4 mà bạn

Với lại là bằng :

6''675

7785.,77

664'87'9776''8

lớp 1 mà cậu

4.24.5²-(3³.18+3³.12)

=4.24.25-[27.(18+12)]

=(4.25).24-[27.30]

=100.24-810

=2400-810

=1590