A = ( 54 + 65 + 31 ) + ( -72+-28) + 120 

A =  150+-100 + 120

A = 50 + 120

A = 170

236 : 3 +64 : 3
=(236+64):3
=300:3=100
1159:125-159:125
=(1159-159):125
=1000:125=8

(236 + 64) : 3 = 300 : 3 = 100

(1159 - 159) : 125 = 1000 : 125 = 8

\(86+357+14=457\)

\(72+69+128=275\)

\(25\cdot5\cdot4\cdot27\cdot2=27000\)

\(28\cdot64+28\cdot36=28\left(64+36\right)=2800\)

a) \(86+357+14=\left(86+14\right)+357=100+357=457\)

b) \(72+69+128=\left(72+128\right)+69=200+69=269\)

c) \(25.5.4.27.2=\left(25.4\right).\left(5.2\right).27=100.10.27=27000\)

d) \(28.64+28.36=28\left(64+36\right)=28.100=2800\)

(16³-64²):8

=(4096-4096):8

=0:8

=0

= (16+64)(16-64)

-4800

  -38.(25-4)+25.(-4+38)

=   -38.21   +   25.34

=     -789    +    850

=  61

cho mik nha mọi người

-38 . ( 25 - 4 ) + 25 . ( -4 + 38 )

= -38 . 21 + 25 . 34

= -798 + 850

= 52

\(\left(16^3-64^2\right):8^3\)

\(\Leftrightarrow\left(4096-4096\right):512\)

\(\Leftrightarrow0.512\)

\(\Leftrightarrow0\)

a: \(=205-\left[1200-\left(16-6\right)^3\right]:140\)

\(=205-\left[1200-10^3\right]:140\)

\(=205-\dfrac{200}{140}=205-\dfrac{10}{7}=\dfrac{1425}{7}\)

b: \(=\left[25-4\cdot3+9\cdot4+16\right]:5\)

\(=\left(25-12+36+16\right):5=\dfrac{65}{5}=13\)