Question

hộ mik vs

Answer 1

Bài 1:

a: \(-\frac25\cdot\frac{15}{4}+\frac13=\frac{-3}{2}+\frac13\)

\(=-\frac96+\frac26=-\frac76\)

b: \(\left|-\frac{7}{15}\right|\cdot\frac{16}{23}+\frac{7}{15}\cdot\frac{7}{23}+\left(-1\right)\)

\(=\frac{7}{15}\cdot\frac{16}{23}+\frac{7}{15}\cdot\frac{7}{23}+\left(-1\right)\)

\(=\frac{7}{15}\left(\frac{16}{23}+\frac{7}{23}\right)+\left(-1\right)=\frac{7}{15}-1=-\frac{8}{15}\)

c: \(\left(-\frac12\right)^2-\frac{3}{25}\cdot\sqrt{25}+\left|-0,6\right|\)

\(=\frac14-\frac{3}{25}\cdot5+0,6\)

\(=\frac14-\frac35+\frac35=\frac14\)

Bai 2:

a: \(\frac23-x=\frac34\)

=>\(x=\frac23-\frac34\)

=>\(x=\frac{8}{12}-\frac{9}{12}=-\frac{1}{12}\)

b: \(4\left|x+1\right|+\frac23=2\)

=>\(4\left|x+1\right|=2-\frac23=\frac43\)

=>\(\left|x+1\right|=\frac13\)

=>\(\left[\begin{array}{l}x+1=\frac13\\ x+1=-\frac13\end{array}\right.\Rightarrow\left[\begin{array}{l}x=\frac13-1=-\frac23\\ x=-\frac13-1=-\frac43\end{array}\right.\)

c: \(\left(x^2+4\right)\left(3-\sqrt{x}\right)=0\)

=>\(3-\sqrt{x}=0\)

=>\(\sqrt{x}=3\)

=>x=9(nhận)

Answer 2

a)= -3/2 + 1/3 = -7/6

b) = 7/15. 16/23 + 7/15. 7/23 + (-1)

= 7/15.(16/23 + 7/23) + (-1)

= 7/15. 1 + (-1)

= 7/15 + (-1)

= -8/15

c) = 1/4 - 3/5 + 0,6

= 1/4

Bài 2 :

a) 2/3 - x = 3/4

x =2/3 - 3/4

x = -1/12

b) 4|x + 1| = 4/3

|x + 1| = 1/3

- Trường hợp 1 : x + 1 = 1/3

x = 2/3

- Trường hợp 2 : x + 1 = -1/3

x = -4/3