ai giúp với

Bài 1: 

a: -5-12=-17

b: (-4)x14=-56

c: 6-12=-6

Bài 2: 

a: =-5+42-15=42-20=22

b: \(=369-4\cdot\left[-5-32\right]=369+148=517\)

c: \(=-8+8=0\)

d: \(=13\left(-12-29\right)=13\cdot\left(-41\right)=-533\)

Bài II:

1: Ta có: \(x+\dfrac{3}{5}=\dfrac{1}{2}-\dfrac{3}{10}\)

\(\Leftrightarrow x+\dfrac{3}{5}=\dfrac{1}{5}\)

hay \(x=-\dfrac{2}{5}\)

4. C

6. B

c

b

c

b

\(\frac{12}{1}:\frac{6}{5}+\frac{4}{7}=\frac{60}{6}+\frac{7}{4}=\frac{10}{1}+\frac{7}{4}=\frac{40}{4}+\frac{7}{4}=\frac{47}{4}\)

\(\left(\frac{5}{6}+\frac{3}{4}\right)\cdot\frac{8}{19}=\frac{38}{24}\cdot\frac{18}{9}=\frac{38}{24}\cdot2=\frac{76}{24}=\frac{19}{6}\)

\(\left(\frac{7}{4}-\frac{5}{3}\right)\cdot\frac{2}{3}=\frac{1}{12}\cdot\frac{2}{3}=\frac{1}{13}\)

câu 1 : 62/35

câu 2 : 2/3

câu 3 : 1/18

nhớ tk m nhé

câu 1: 12:6/5+4/7=47/21

câu 2: (5/6+3/4):19/8=2/3

câu 3: (7/4-5/3):3/2=1/18

1, 1+2+3+4+5+6 = 21

2, ok

3, khi : 4:3 = tứ : tam=tám:tư=8:4=2

tk nha

1) 21 

2) ok

3) I don't no

tk nha nha nah nha nha nha nha nha nha nha nha nha nha nha nha !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!