Sửa đề : 3% của 6m

6 x 3% = 0,18 ( m) = 18 cm

=> Chọn C

3% của 6 = 6 . 3% = 6. 0,03=0,18(m)=18(cm)

Ý C

D. 1000 đồng

100 000 đồng x 1%

1% x 100000 = 1000 đồng

Chọn D

\(\dfrac{26^4}{\left(-13\right)^5}=\dfrac{13^4.2^4}{13^4.\left(-13\right)}=\dfrac{2^4}{-13}=-\dfrac{16}{13}\)

\(-\dfrac{16}{3}\)nhé

\(x+2x+3x+...+2022x=2022.2023\\ \Leftrightarrow\left(1+2022\right).1011.x=2022.2023\\ \Leftrightarrow2023.1011.x=2022.2023\\ \Leftrightarrow1011.x=2022\\ \Leftrightarrow x=\dfrac{2022}{1011}=2\\ Vậy:x=2\)

àm như bạn pop pop là đúng nha,x=2 nhé

 2/2023 / 4/3 ?

A = \(\dfrac{\dfrac{2}{3}-\dfrac{2}{13}+\dfrac{2}{2023}}{\dfrac{4}{3}-\dfrac{4}{13}+\dfrac{4}{2023}}\)

A = \(\dfrac{2.\left(\dfrac{1}{3}-\dfrac{1}{13}+\dfrac{1}{2023}\right)}{4.\left(\dfrac{1}{3}-\dfrac{1}{13}+\dfrac{1}{2023}\right)}\)

A = \(\dfrac{1}{2}\)

\(\dfrac{2001.2002+1981+2003.21}{2002.2003-2001.2002}\)

\(=\dfrac{2001.2002+1981+\left(2002+1\right).21}{2002.\left(2003-2001\right)}\)

\(=\dfrac{2001.2002+1981+21+2002.21}{2002.2}\)

\(=\dfrac{2001.2002+2002+2002.21}{2002.2}\)

\(=\dfrac{2002\left(2001+1+21\right)}{2002.2}=\dfrac{2023}{2}\)

Ta có:

\(45=3^2\cdot5\)

\(36=2^2\cdot3^2\)

\(\Rightarrow BCNN\left(45,36\right)=3^2\cdot2^2\cdot5=180\)

Ta có: 45= 3².5

           36=2².3²

⇒ BCNN(45;36)=3².5.2²=180

Tổng lượng gạo 3 xe chở:

3,8 + 4,3 + 4,5 = 12,6(tấn)

Trung bình mỗi xe chở:

12,6:3=4,2(tấn)

Đ.số: 4,2 tấn gạo

\(\dfrac{99}{98}-\dfrac{98}{97}+\dfrac{1}{97\cdot98}\)

\(=\dfrac{99\cdot97}{98\cdot97}-\dfrac{98\cdot98}{97\cdot98}+\dfrac{1}{97\cdot98}\)

\(=\dfrac{99\cdot97-98^2+1}{98\cdot97}\)

\(=\dfrac{\left(98+1\right)\left(98-1\right)-98^2+1}{98\cdot97}\)

\(=\dfrac{98^2-1-98^2+1}{98\cdot97}\)

\(=\dfrac{0}{97\cdot98}\)

\(=0\)

\(\dfrac{99}{98}-\dfrac{98}{97}+\dfrac{1}{97.98}=\dfrac{99.97}{97.98}-\dfrac{98.98}{97.98}+\dfrac{1}{97.98}\)

\(=\dfrac{99.97-98.98+1}{97.98}=\dfrac{\left(98+1\right).\left(98-1\right)-98^2+1}{97.98}\)

\(=\dfrac{98^2-1-98^2+1}{97.98}=0\)

- x  + 20 = - ( - 15) - (  +8)  +  13

20 - x = 15 - 8 + 13

20 - x = 7 + 13

20 - x = 20

x = 20 - 20

x=0

Vậy: x=0