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1/13.58.4+32.26.2+52.10
=52.58+52.32+52.10
=52(58+32+10)=52.100=5200
2/15.37.4+120.21+21.5.12
=60.37+120.21+60.21
=60(37+2.21+21)=60.100=6000
x/5=2/3:16/21 b)x/10=4/5.3/4 NHỚ K NHÉ MỌI NGƯỜI
x/5=2/3.21/16 x/10=3/5
x/5=7/8 =>x=3.10/5
=>x=5.8/7 =>x=6
=>x=40/7
\(\frac{2}{3}:\frac{x}{5}=\frac{16}{21}\)
\(\Rightarrow\frac{x}{5}=\frac{2}{3}:\frac{16}{21}\)
\(\Rightarrow\frac{x}{5}=\frac{2}{3}.\frac{21}{16}\)
\(\Rightarrow\frac{x}{5}=\frac{7}{8}\)
\(\Rightarrow x=\frac{7.5}{8}\)
\(\Rightarrow x=\frac{35}{8}\)
Vậy \(x=\frac{35}{8}\)
b) \(\frac{x}{10}:\frac{3}{4}=\frac{4}{5}\)
\(\Rightarrow\frac{x}{10}=\frac{4}{5}.\frac{3}{4}\)
\(\Rightarrow\frac{x}{10}=\frac{3}{5}\)
\(\Rightarrow x=\frac{3.10}{5}\)
\(\Rightarrow x=6\)
Vậy \(x=6\)
Chúc bạn học tốt !!!
(3/4+x).1/2=4/5
3/4+x=4/5:1/2
3/4+x=8/5
x=8/5-3/4
x=17/20
b)420:[75-(x-10)]=21
75-(x-10)=420:21
75-(X-10)=20
X-10=75-20
X-10=55
X=55+10
X=65
K ĐÓ NHÉ
5/2+x=-3/5
x=-3/5-5/2
x=-31/10
vậy x=-31/10
-2x+5=23
-2x=23-5
-2x=18
x=18:-2
x=-9
vậy x=-9
Bài làm :
\(\frac{5}{2}+x=-3,5\)
\(\Leftrightarrow x=-3,5-\frac{5}{2}=-6\)
\(-2x+5=23\)
\(\Leftrightarrow-2x=18\)
\(\Leftrightarrow x=-9\)
\(\frac{x}{21}=\frac{2}{7}-\frac{4}{3}\)
\(\Leftrightarrow\frac{x}{21}=-\frac{22}{21}\)
\(\Leftrightarrow x=-22\)
\(\frac{5}{3}x-\frac{2}{5}x=\frac{19}{10}\)
\(\Leftrightarrow x\left(\frac{5}{3}-\frac{2}{5}\right)=\frac{19}{10}\)
\(\Leftrightarrow\frac{19}{15}x=\frac{19}{10}\)
\(\Leftrightarrow x=\frac{3}{2}\)
Chúc bạn học tốt !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
a) x/21=4/7+-7/3
x/21=-37/21
x =-37
Vậy x =-37
b)x/4+x/5=-9/10
x:4+x:5=-9/10
x.(-4)+x.(-5)=-9/10
x.(-4+(-5))=-9/10
x.(-9) =-9/10
x =-9/10:(-9)
x = 1/10
Vậy x =1/10
a. \(\dfrac{3}{4}\) : x - \(\dfrac{17}{5}\) = \(\dfrac{7}{10}\)
\(\dfrac{3}{4}\) : x = \(\dfrac{7}{10}\) + \(\dfrac{17}{5}\)
\(\dfrac{3}{4}\) : x = \(\dfrac{41}{10}\)
x = \(\dfrac{3}{4}\) : \(\dfrac{41}{10}\)
x = \(\dfrac{3}{4}\) . \(\dfrac{10}{41}\)
x = \(\dfrac{15}{82}\)
Vậy x = \(\dfrac{15}{82}\)
\(21-5\left(x-4\right)=10\)
\(5\left(x-4\right)=21-10\)
\(5\left(x-4\right)=11\)
\(x-4=\dfrac{11}{5}\)
\(x=\dfrac{11}{5}+4=\dfrac{31}{5}\)