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Bạn ghi sai đề chỗ 3/11 là sai mà phải 2/11 với là chỗ 2/7 là sai mà là 2/9
\(A=\frac{\frac{2}{5}-\frac{2}{7}+\frac{2}{11}}{\frac{7}{5}-\frac{7}{9}-\frac{7}{11}}:\frac{\frac{1}{3}-\frac{1}{4}+\frac{1}{5}}{\frac{7}{6}-\frac{7}{8}+\frac{7}{10}}=\frac{2\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{11}\right)}{7\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{11}\right)}:\frac{\frac{1}{3}-\frac{1}{4}+\frac{1}{5}}{7\left(\frac{1}{6}-\frac{1}{8}+\frac{1}{10}\right)}\)
\(=\frac{2}{7}:\frac{\frac{1}{3}-\frac{1}{4}+\frac{1}{5}}{\frac{7}{2}.\left(\frac{1}{3}-\frac{1}{8}+\frac{1}{10}\right)}=\frac{2}{7}:\frac{2}{7}=1\)
b,\(A.x+\frac{5}{6}=-\frac{3}{4}\)
<=>\(1.x=-\frac{3}{5}-\frac{5}{6}\)
<=>x=-43/30
Ai thấy mình làm đúng thì tích nha.Ai tích mình mình tích lại
a,A=1863/623:2/7
A=1863/178
b,
ta có:
1863/178.x+5/6=-3/4
1863/178.x=-19/12
=>x=-1691/11178
a) \(\frac{x}{3}=\frac{2}{3}+\frac{-1}{7}\)
\(\Leftrightarrow\frac{11}{21}=\frac{x}{3}\)
\(\Rightarrow\frac{11}{21}=\frac{7x}{21}\)
\(\Rightarrow\)\(11=7x\)
\(\Rightarrow\)\(x=11:7=\frac{11}{7}\)
b) \(\frac{2}{3}x-\frac{4}{5}=\frac{-3}{10}\)
\(\frac{2}{3}x=\frac{-3}{10}+\frac{4}{5}\)
\(\frac{2}{3}x=\frac{1}{2}\)
\(\Rightarrow x=\frac{1}{2}:\frac{2}{3}\)
\(\Rightarrow x=\frac{3}{4}\)
Mình trả lời nha
a) 3 và 1/5.x=1 và 3/5+7/10
16/5.x=8/5+7/10
16/5.x=23/10
x=23/10:16/5
x=23/32
b)2 và 1/4(x-7 và 1/3)=1,5
9/4(x-22/3)=3/2
x-22/3=3/2:9/4
x-22/3=2/3
x =2/3+22/3
x =8
****
a) \(\frac{31}{5}\).x = \(\frac{13}{5}\)+ \(\frac{7}{10}\)
31/5 . x = 33/10
x = 33/10 : 31/5
x = 33/62
b) 21/4 . ( x - 71/3 ) = 1,5
21/4 . (x- 71/3) = 3/2
x - 71/3 = 3/2 : 21/4
x - 71/3 = 2/7
x = 2/7 + 71/3
x = 503/21
a, \(\frac{1}{6}x+\frac{1}{10}-\frac{4}{15}x+1=0\)
\(\Leftrightarrow-\frac{1}{10}x=-\frac{11}{10}\)
\(\Leftrightarrow x=11\)
b,\(\left(\frac{1}{7}x-\frac{2}{7}\right)\left(-\frac{1}{5}x+\frac{3}{5}\right)\left(\frac{1}{3}x+\frac{4}{3}\right)=0\)
\(\Leftrightarrow\frac{1}{7}x-\frac{2}{7}=0\)hoặc \(-\frac{1}{5}x+\frac{3}{5}=0\)hoặc \(\frac{1}{3}x+\frac{4}{3}=0\)
+) \(\frac{1}{7}x-\frac{2}{7}=0\Leftrightarrow\frac{1}{7}x=\frac{2}{7}\Leftrightarrow x=2\)
+)\(-\frac{1}{5}x+\frac{3}{5}=0\Leftrightarrow-\frac{1}{5}x=-\frac{3}{5}\Leftrightarrow x=3\)
+)\(\frac{1}{3}x+\frac{4}{3}=0\Leftrightarrow\frac{1}{3}x=-\frac{4}{3}\Leftrightarrow x=-4\)
c, \(\frac{1}{2}x-\frac{11}{15}:\frac{33}{35}=-\frac{1}{3}\)
\(\Leftrightarrow\frac{1}{2}x-\frac{7}{9}=-\frac{1}{3}\)
\(\Leftrightarrow\frac{1}{2}x=\frac{4}{9}\)
\(\Leftrightarrow x=\frac{8}{9}\)
a/ \(\frac{1}{6}x+\frac{1}{10}-\frac{4}{15}x+1=0\)
\(\Rightarrow-\frac{1}{10}x=-\frac{11}{10}\)
\(\Rightarrow x=11\)
b/ \(\left(\frac{1}{7}x-\frac{2}{7}\right)\left(-\frac{1}{5}x+\frac{3}{5}\right)\left(\frac{1}{3}x+\frac{4}{3}\right)=0\)
\(\Rightarrow\frac{1}{7}x-\frac{2}{7}=0\Rightarrow\frac{1}{7}x=\frac{2}{7}\Rightarrow x=2\)
hoặc \(-\frac{1}{5}x+\frac{3}{5}=0\Rightarrow-\frac{1}{5}x=-\frac{3}{5}\Rightarrow x=3\)
hoặc \(\frac{1}{3}x+\frac{4}{3}=0\Rightarrow\frac{1}{3}x=-\frac{4}{3}\Rightarrow x=-4\)
Vậy x = 2, x = 3, x = -4
c/ \(\frac{1}{2}x-\frac{11}{15}:\frac{33}{35}=-\frac{1}{3}\)
\(\Rightarrow\frac{1}{2}x-\frac{7}{9}=-\frac{1}{3}\)
\(\Rightarrow\frac{1}{2}x=\frac{4}{9}\Rightarrow x=\frac{8}{9}\)
Vậy x = 8/9
\(2.\left(\frac{3}{2}-x\right)-5.\left(x-\frac{3}{10}\right)=\frac{7}{4}\)
\(\Rightarrow2.\frac{3}{2}-2x-5x+5.\frac{3}{10}=\frac{7}{4}\)
\(\Rightarrow\frac{3}{2}+3-7x=\frac{7}{4}\)
\(\Rightarrow\frac{9}{2}-\frac{7}{4}=7x\)
\(\Rightarrow\frac{11}{4}:7=x\Rightarrow x=\frac{11}{28}\)
=3-2x-5x+3/2=7/4
=>3-7x=7/4-3/2=1/4
=>7x=3-1/4=11/4
=>x=11/4:7=11/28
Ta có x/5+7/3=10/3
x/5=10/3-7/3
x/5=1
=>x=5
=> x/5= 10/3-7/3
=> x/5=3/3
=> x/5=1=5/5
=> x=5