9/4;4/5;5/7;7/12;5/12

`5030,407`

5030,407

\(\dfrac{7}{5}+\dfrac{4}{7}-\dfrac{9}{10}=\dfrac{49-20}{35}-\dfrac{9}{10}=\dfrac{19}{35}-\dfrac{9}{10}=\dfrac{190-315}{350}=\dfrac{-125}{350}\)

\(\dfrac{2}{1}+\dfrac{3}{4}\text{×}\dfrac{8}{5}=\dfrac{8+3}{4}\text{×}\dfrac{8}{5}=\dfrac{11\text{×}8}{4\text{×}5}=\dfrac{88}{20}\)

mấy câu kia áp dụng là dc!

Oki

\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}\)

\(=\left(\frac{7}{12}+\frac{1}{12}\right)-\frac{2}{7}\)

\(=\frac{2}{3}-\frac{2}{7}\)

\(=\frac{8}{21}\)

~Học tốt~

7/12-2/7+1/12

=(7/12+1/12)-2/7

=2/3(rút gọn)-2/7

=8/21

k for me 

Mình cầu xin mọi người đấy ! Giúp mình với !  Help me !

2
−
(
5
3
8
+
x
−
7
5
24
)
:
16
2
3
=
0

⇒
2
−
(
5
3
8
+
x
−
7
5
24
)
=
0
 

⇒
5
3
8
+
x
−
7
5
24
=
2

⇒
5
3
8
+
x
=
9
5
24

⇒
x
=
3
5
6

a) x-5/7=3/5x1/2
    x-5/7=3/10
    x.     =3/10+5/7
    x.     =71/70
b) Xx2/3=5/8x3/4
    Xx2/3=15/32
    X       =15/32:2/3
    X       =45/64

a) x - 5/7 = 3/5 × 1/2

x - 5/7 = 3/10

x = 3/10 + 5/7

x = 71/70

b) x × 2/3 = 5/8 × 3/4

x × 2/3 = 15/32

x = 15/32 : 2/3

x = 45/64

câu hỏi là j em ơi

Đề bài yêu cầu gì?

\(6\frac{2}{15}:3\frac{5}{7}=\frac{92}{15}:\frac{26}{7}=\frac{92}{15}\times\frac{7}{26}=\frac{322}{195}\)

\(6\frac{2}{15}\)\(:3\frac{5}{7}\)

\(=\frac{92}{15}\)\(:\frac{26}{7}\)

\(=\frac{92}{15}\)\(\times\frac{26}{7}\)

\(=\frac{322}{195}\)

1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9+10+10 = 110

HT

=110 nha

HT