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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 :))
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) \(x\cdot\frac{5}{12}=\frac{8}{9}\)
\(x=\frac{8}{9}:\frac{5}{12}\)
\(x=\frac{8}{9}\cdot\frac{12}{5}\)
\(x=\frac{32}{15}\)
\(\frac{7}{8}>\frac{7}{9}>\frac{7}{10}>\frac{7}{11}>\frac{7}{15}\)
Tính :
\(a,\frac{1}{4}+\frac{3}{8}+\frac{5}{16}=\frac{4+6+5}{16}=\frac{15}{16}\)
\(b,\frac{3}{5}-\frac{1}{3}-\frac{1}{6}=\frac{18-10-5}{30}=\frac{3}{30}=\frac{1}{10}\)
\(c,\frac{4}{7}\times\frac{5}{8}\times\frac{7}{12}=\frac{5}{14}\times\frac{7}{12}=\frac{5}{24}\)
\(d,\frac{25}{28}:\frac{15}{14}\times\frac{6}{7}=\frac{25\times14\times6}{28\times15\times7}=\frac{5}{7}\)
a) /x+2/=0
=>x+2=0
=>x=0-2
=>x=-2
\(\text{a) /x+2/=0}\)
\(\Rightarrow x=0-2\)
\(\Rightarrow x=2\)
\(\text{b) /x-5/=/-7/}\)
\(\Rightarrow\text{/x-5/=7}\)
\(\Rightarrow\orbr{\begin{cases}x-5=7\\x-5=-7\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=12\\x=-2\end{cases}}\)
\(\text{c) /x-3/=7-(-2)}\)
\(\Rightarrow/x-3/=9\)
\(\Rightarrow\orbr{\begin{cases}x=-9+3=-6\\x=9+3=12\end{cases}}\)