b: =1,6+2,7-4,2-94*0,7+99*2,7

=100*2,7-100*0,7+1,6

=200+1,6

=201,6

a: \(=\dfrac{4832}{16038}=\dfrac{2416}{8019}\)

\(=\dfrac{3}{7}\cdot\dfrac{7}{3}\cdot\dfrac{-2}{5}\cdot20\cdot\dfrac{19}{72}=-8\cdot\dfrac{19}{72}=-\dfrac{19}{9}\)

A xin lỗi mình viết sai đề để mình viết lại

(0,25 - 3/4) : 2/3 + (-1/2)^2

\(\left(0,25-\frac{3}{4}\right)\div\frac{2}{3}+\left(\frac{-1}{2}\right)^2\)²

\(=\left(\frac{1}{4}-\frac{3}{4}\right)\times\frac{3}{2}+\frac{1}{4}\)

\(=\frac{-1}{2}\times\frac{3}{2}+\frac{1}{4}\)

\(=\frac{-3}{4}+\frac{1}{4}\)

\(=\frac{-2}{4}=\frac{-1}{2}\)

a) 42.14+84.32-42.28

=42.14+42.2.32-42.28

=42.(14+2.32-28)

=42.(14+64-28)

=42.58 

=2436

b) 45.16-90+45.76

=45.16-45.2+45.76

=45.(16-2+76)

=45.90

=4050

1. \(450\%+3=\dfrac{9}{2}+3=\dfrac{15}{2}\)

2. \(\dfrac{1}{4}-2,75+2=0,25-2,75+2=-0,5\)

3. \(\dfrac{3}{10}+2,7=0,3+2,7=3\)

\(\frac{1}{2}+\frac{1}{3}+1,6\)

\(=\frac{1}{2}+\frac{1}{3}+\frac{8}{5}\)

\(=\frac{15}{30}+\frac{10}{30}+\frac{48}{30}\)

\(=\frac{73}{30}\)

 #hoktot<3# 

bằng73/30

1/2 + 1/3 + 1,6 

= 1/2 + 1/3 + 8/5 

= 15/30 + 10/30 + 48/30 

= 25/30 + 48/30 

= 73/30

= 4,8 x 1994 + 4,8 x 996 - 1,2 - 3960

= 4,8 x (1994 + 996) - 1,2 - 3960

= 4,8 x 2990 - 1,2 - 3960

= 1435,2 - 1,2 - 3960

= -2526

#chanh

`30 000-15 273-4727`

`= 30 000-(15 273+4727)`

`=30 000-20000`

`=10 000`

`49 573-(25 000+9573)`

`=49 573-25 000-9573`

`=(49 573-9573)-25 000`

`=40000-25000`

`=15000`

giúp em đi ạ em cần gấp lắm rồi

a: =30000-20000=10000

b: =40000-25000=15000