Ta có :

X x 4,9 + X : 10 = 1,2

X x 4,9 + X x 0,1 = 1,2

X x ( 4,9 + 0,1 ) = 1,2

X x 5 = 1,2

X = 1,2 : 5

X = 0,24

Hok tốt !   

X = 0,24.

Lm như bài bình thường thui

Hok tốt

\(B=\frac{3^{12}.13+3^{12}.3}{3^{11}.2^{24}}\)

\(B=\frac{3^{12}.\left(13+3\right)}{3^{11}.2^{24}}\)

\(B=\frac{3^{12}.16}{3^{11}.2^{24}}\)

\(B=\frac{3^{12}.2^4}{3^{11}.2^{24}}\)

\(B=\frac{3}{2^{20}}\)

B = 3/2 mũ 20

mình cũng thấy khó bạn ạ

Tham khảo

1. To stay healthy you eat more vegetables and eat less high fat food.

2. To prevent flu we eat a lot of garlic and we keep our bodies expecially feel warm.

3.  It began to rain so i opened my umbrella.

4. It began to rain but he didn't open his umbrella.

5. He wored hard so he could earn much moneys.

6, Study hard or you will fail the exam.

7. Dan didn't study for exam but Lan did.

8. I understand your point of view but i don't agree with it.

9. He lied to her however she still likes and trusts him.

Cou thông minh thế giải đc các bài khó của mik.Cx cảm ơn 

-ĐKXĐ: \(x\ne2\)

\(B=\dfrac{x^2-2x+5}{x^2-4x+4}=\dfrac{x^2-2x+5+x^2-4x+4-\left(x^2-4x+4\right)}{x^2-4x+4}=\dfrac{x^2-6x+9}{x^2-4x+4}-1=\left(\dfrac{x-3}{x-2}\right)^2-1\ge-1\)\(B=-1\Leftrightarrow x=3\)

-Vậy \(B_{min}=-1\)

x^2 + x^2 sao lai ra x^2 ???

Toàn spam linh tinh thôi

cái gì vậy

\(1+cota+cot^2a+cot^3a\)

\(=1+\dfrac{cosa}{sina}+\dfrac{cos^2a}{sin^2a}+\dfrac{cos^3a}{sin^3a}\)

\(=\left(1+\dfrac{cosa}{sina}\right)\left(1+\dfrac{cos^2a}{sin^2a}\right)\)

\(=\dfrac{sina+cosa}{sina}.\dfrac{sin^2a+cos^2a}{sin^2a}\)

\(=\dfrac{cosa+sina}{sin^3a}\)

Cô Mến ơi phải Toán lớp 6 không

dấu chấm là phép nhân . trên 2 là bình phương ý là nhân tiếp với số bên trái

dễ mà