12,36 x10=123,6 ( nói thất nha mình lớp 10 rồi đó chửi nhè nhẹ thôi đúng đến cha ông bố mẹ là tao chém nha ) ( mình cũng mờ rồi xin bạn thông cảm có gì bạn xí xóa)
12.36 x 3.5 + 12,36 x2.4+12.36 x 4.1 =
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12.36 x 3.5 + 12,36 x.4+12.36 x 4.1 =
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12.36 x 3.5 + 12,36 x.4+12.36 x 4.1 =
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tìm x
a) 6(x-4)+3(x-2)-8(3+x)=14
b) 5(x-7)-4(x+5)=3.5-12
Tìm x, biết : \(\dfrac{1}{1.3}+\dfrac{1}{3.5}+\dfrac{1}{5.7}+...+\dfrac{1}{x\left(x+1\right)}=\dfrac{1005}{2011}\)
\(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+...+\frac{2}{x\left(x+2\right)}=\frac{15}{45}\)
\(\text{Tìm x, biết:}\)
\(a\)) \(x-\dfrac{2}{3.5}-\dfrac{2}{5.7}-\dfrac{2}{7.9}-\dfrac{2}{9.11}-\dfrac{2}{11.13}-\dfrac{2}{13.15}=\dfrac{2}{5}\)
\(b\)) \(\dfrac{1}{2.3}.x+\dfrac{1}{3.4}.x+\dfrac{1}{4.5}.x+...+\dfrac{1}{49.50}.x=1\)
\(c\)) \(x-\dfrac{20}{11.3}-\dfrac{20}{13.15}-...-\dfrac{53}{55}=\dfrac{3}{11}\)
\(d\)) \(x+\dfrac{4}{5.9}+\dfrac{4}{9.13}+...+\dfrac{4}{41.45}=\dfrac{-37}{45}\)
\(e\)) \(\left(\dfrac{11}{12}.\dfrac{11}{2.23}.\dfrac{11}{23.34}...\dfrac{11}{89.100}\right).x=\dfrac{5}{3}\)
\(f\)) \(\left(\dfrac{2}{11.13}.\dfrac{2}{13.15}.\dfrac{2}{15.17}...\dfrac{2}{19.21}\right)-x+4+\dfrac{221}{231}=\dfrac{7}{3}\)
a) (\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{132}\)) . x =\(\frac{1}{3}\)
b) (\(\frac{2}{1.3}+\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}\)) : x = \(\frac{2}{3}\)
c) (\(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+\frac{1}{9.11}\)) . x = \(\frac{2}{3}\)
Mik đang cần gấp
1: thực hiện phép tính
a)41.443+75.25-512
b)600 :{ 450:[450-(4.5^3-2^3.5^2)]}
2;tìm x , biết
a)243-x+17=136 b)84-(21+x)=24+x
c)x+6:x(x thuộc n,x khác 0)
giúp mk nha các bn 
