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a) x - \(\frac{1}{8}\)= \(\frac{7}{3}\)x \(\frac{21}{4}\)
x - \(\frac{1}{8}\)= \(\frac{49}{4}\)
x = \(\frac{49}{4}\)+ \(\frac{1}{8}\)
x = 98
b) x : \(\frac{3}{2}\) = \(\frac{1}{4}\)
x = \(\frac{1}{4}\)x \(\frac{3}{2}\)
x = \(\frac{3}{8}\)
c) \(\frac{103}{10}\) - x = \(\frac{4}{5}\)
x = \(\frac{103}{10}\)- \(\frac{4}{5}\)
x = \(\frac{19}{5}\)
d) x = 51 x \(\frac{4}{17}\)
x = \(12\)
gọi 3 số lẻ liên tiếp là a;a+2;a+4(a lẻ)
vì tổng bằng 21 nên tacos a+(a+2)+(a+4)=21
=>a=5
vậy số thứ nhất ,thứ 2,3 lll 5;7;9
x+8+5:2=10
x+8+2,5=10
x+8=10-2,5
x+8=7,5
x=7,5-8
x= -0,5
\(x\times2+\frac{x}{2}=10\)
\(\Leftrightarrow x\times2+x\times\frac{1}{2}\)
\(\Leftrightarrow x\left(2+\frac{1}{2}\right)=10\)
\(\Leftrightarrow x\left(\frac{4}{2}+\frac{1}{2}\right)=10\)
\(\Leftrightarrow x\times\frac{5}{2}=10\)
\(\Leftrightarrow x=4\)
x + 5/9 = 9/5
x = 9/5 - 5/9
x = 56/45
5/12 - x = 1/3
x = 5/12 - 1/3
x = 1/12
1/5 + x = 7/12
x = 7/12 - 1/5
x = 23/60
x - 7/12 = 5/4
x = 5/4 + 7/12
x = 11/6
tk mk nha
cảm ơn mọi người nhiều lắm ạ ! hihi
\(A=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}\)
= \(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}\)
= \(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}\)
= \(1-\frac{1}{7}\)
= \(\frac{7}{7}-\frac{1}{7}\)
= \(\frac{6}{7}\)
2) \(\frac{7}{4}-x.\frac{4}{3}=\frac{5}{19}\)
\(x.\frac{4}{3}=\frac{7}{4}-\frac{5}{19}\)
\(x.\frac{4}{3}=\frac{133}{76}-\frac{20}{76}\)
\(x.\frac{4}{3}=\frac{113}{76}\)
\(x=\frac{113}{76}:\frac{4}{3}\)
\(x=\frac{399}{304}\)
VẬY \(x=\frac{399}{304}\)
b) \(\left(x+\frac{3}{4}\right).\frac{5}{7}=\frac{10}{9}\)
\(\left(x+\frac{3}{4}\right)=\frac{10}{9}:\frac{5}{7}\)
\(x+\frac{3}{4}=\frac{14}{9}\)
\(x=\frac{14}{9}-\frac{3}{4}\)
\(x=\frac{29}{36}\)
Vậy \(x=\frac{29}{36}\)
c) \(x.\frac{1}{2}+\frac{3}{2}.x=\frac{4}{5}\)
\(x.\left(\frac{1}{2}+\frac{3}{2}\right)=\frac{4}{5}\)
\(x.2=\frac{4}{5}\)
\(x=\frac{4}{5}:2\)
\(x=\frac{2}{5}\)
Vậy \(x=\frac{2}{5}\)
Chúc bạn học tốt !!!
\(\times+\left(\times+1\right)+\cdot\cdot\cdot+\left(\times+10\right)=660\)
\(\Rightarrow11\times+\left(1+2+\cdot\cdot\cdot+10\right)=660\)
\(\Rightarrow11\times+55=660\)
\(\Rightarrow11\times=660-55\)
\(\Rightarrow11\times=605\)
\(\Rightarrow\times=55\)