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a, X-2/7=1/5
X = 1/5 + 2/7
X = 17/35
b,15/8-X=3/2
X = 15/8-3/2
X = -5/8
c, X x 7/5= 7/20
X = 7/20 : 7/5
X = 1/4
d, 18/25 : X= 9/5
X = 18/25 :9/5
X = 2/5
Nhớ k cho mình nhé! cảm ơn và chúc bạn học tốt :))
- Tính giá trị biểu thức:
a) (2/5 x 25/29) + (3/5 x 25/29)
= (50/145) + (75/145)
= 125/145
b) (5/2 x 3/7) - (3/14 : 6/7)
= 15/14 - (3/14 x 7/6)
= 15/14 - 1/2
= (30/28) - (14/28)
= 16/28
= 4/7
c) (15/4 : 5/12) - (6/5 : 11/15)
= (15/4 x 12/5) - (6/5 x 15/11)
= 180/20 - 90/55
= 9 - 18/11
= (99/11) - (18/11)
= 81/11
= 7 4/11
- Tính giá trị biểu thức:
a) (2/3) + (20/21 x 3/2 x 7/5)
= 2/3 + (60/210)
= 2/3 + 2/7
= (14/21) + (6/21)
= 20/21
b) (5/17 x 21/32 x 47/24 x 0)
= 0
c) (11/3 x 26/7) - (26/7 x 8/3)
= (286/21) - (208/21)
= 78/21
= 3 9/21
= 3 3/7
- Tìm x:
a) (25/8) : x = 5/16
=> (25/8) x (16/5) = x
=> 4 = x
b) x + (7/15) = 6/15
=> x = (6/15) - (7/15)
=> x = -1/15
c) x : (28/49) = 7/12
=> x x (49/28) = 7/12
=> x = (7/12) x (28/49)
=> x = 1/2
- Tìm x:
a) 6 x x = (5/8) : (3/4)
=> 6x = (5/8) x (4/3)
=> 6x = 20/24
=> 6x = 5/6
=> x = (5/6) / 6
=> x = 5/36
câu,b,không,đủ,thông,tin,nhan,bạn.
a)x=1/2-1/4
x=1/4
Vậy..
b)x=2/5+3/4
x=23/20
vậy...
c)x=9/35:2/7
x=9/10
vậy...
d)x=5.12/25
x=12/5
vậy...
tk mk nhoaa nếu thấy đúng nha mn
a)x+1/4=1/2
x =1/2-1/4
x =1/4
b)x-3/4=2/5
x =2/5+3/4
x =23/20
c)x x 2/7=9/35
x =9/35:2/7
x =9/10
d)x : 12/25 = 5
x =5 x 12/25
x =12/5
a) 2 x 2 x 2 x ... x 2 x 2 :2
b) 3 x 3 x 3 x ... x 3 x 3 :3
c) 4 x 4 x 4 x ... x 4 x 4 :4
d) 5 x 5 x 5 x ... x 5 x 5 :5
e) 6 x 6 x 6 x ... x 6 x 6 :6
g) 7 x 7 x 7 x...x 7 x 7 :7
h) 8 x 8 x 8 x... x 8 x 8 :8
i) 9 x 9 x 9 x...x 9 x 9 :9
a x+\(\frac{1}{2}\)=\(\frac{5}{7}\)
x=\(\frac{5}{7}\)-\(\frac{1}{2}\)
x=\(\frac{3}{14}\)
b \(\frac{25}{7}\)-x=\(\frac{8}{9}\)
x=\(\frac{25}{7}\)-\(\frac{8}{9}\)
x=\(\frac{169}{43}\)
c \(\frac{15}{11}\)*x=\(\frac{5}{3}\)
x=\(\frac{5}{3}\):\(\frac{15}{11}\)
x=\(\frac{11}{9}\)
D x*\(\frac{5}{12}\)=\(\frac{8}{9}\)
x=\(\frac{8}{9}\):\(\frac{5}{12}\)
x=\(\frac{32}{15}\)
a) \(x+\frac{1}{2}=\frac{5}{7}\)
\(x=\frac{5}{7}-\frac{1}{2}\)
\(x=\frac{10}{14}-\frac{7}{14}\)
\(x=\frac{3}{14}\)
b) \(\frac{25}{7}-x=\frac{8}{9}\)
\(x=\frac{25}{7}-\frac{8}{9}\)
\(x=\frac{225}{63}-\frac{56}{63}\)
\(x=\frac{169}{63}\)
c) \(\frac{15}{11}\cdot x=\frac{5}{3}\)
\(x=\frac{5}{3}:\frac{15}{11}\)
\(x=\frac{5}{3}\cdot\frac{11}{15}\)
\(x=\frac{11}{9}\)
d) \(x\cdot\frac{5}{12}=\frac{8}{9}\)
\(x=\frac{8}{9}:\frac{5}{12}\)
\(x=\frac{8}{9}\cdot\frac{12}{5}\)
\(x=\frac{32}{15}\)
a) /x+2/=0
=>x+2=0
=>x=0-2
=>x=-2
\(\text{a) /x+2/=0}\)
\(\Rightarrow x=0-2\)
\(\Rightarrow x=2\)
\(\text{b) /x-5/=/-7/}\)
\(\Rightarrow\text{/x-5/=7}\)
\(\Rightarrow\orbr{\begin{cases}x-5=7\\x-5=-7\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=12\\x=-2\end{cases}}\)
\(\text{c) /x-3/=7-(-2)}\)
\(\Rightarrow/x-3/=9\)
\(\Rightarrow\orbr{\begin{cases}x=-9+3=-6\\x=9+3=12\end{cases}}\)