Question

tinh bang cach thuan tien 

a 20/11nhan 33/23 nhan 69/180

b (675 ,98+888 ,66+111,34)9 nhan 0.01

Answer 1

\(\frac{20}{11}\cdot\frac{33}{23}\cdot\frac{69}{180}\)

\(=\frac{20\cdot33\cdot69}{11\cdot23\cdot180}\)

\(=\frac{20\cdot3\cdot11\cdot23\cdot3}{11\cdot23\cdot20\cdot3\cdot3}\)

\(=1\)

Answer 2

bài b bạn xem lại đề nha

Answer 3

Dấu . là dấu nhân nha bạn

a) \(\frac{20}{11}.\frac{33}{23}.\frac{69}{180}=\frac{20.11.3.23.3}{11.23.20.3.3}=1\)

b) \(\left(675,98+888,66+111,34\right).9.0,01\)

    \(=\left(675,98+1000\right).9.0,01\)

    \(=1675,98.9.0,01=150,8382\)

Câu b bạn viết ko rõ lắm