56-3.(x-3)=21
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\(\dfrac{21}{17}\times\dfrac{13}{14}\times56\times\dfrac{3}{42}\)
\(=\dfrac{21}{17}\times\dfrac{13}{14}\times56\times\dfrac{1}{14}\)
\(=\dfrac{21\times13\times56}{17\times14\times14}\)
\(=\dfrac{3\times7\times13\times14\times2\times2}{17\times2\times7\times14}\)
\(=\dfrac{3\times13\times2}{17}\)
\(=\dfrac{78}{17}\)
#Sahara |
a/ X : 3 = 12 642
X = 12642 x 3
X = 37 926
b/ X + 21 415 = 56 743
X = 56 743 – 21 415
X = 35 328
21 x 56 - x = 1000
1176 - x = 1000
x = 1176 - 1000
x = 176
tk mk nha
\(a,2x+34=56\\ \Rightarrow2x=56-34\\ \Rightarrow x=22:2\\ \Rightarrow x=11\\ b,87-\left(x-654\right):3=21\\ \Rightarrow\left(x-654\right):3=87-21\\ \Rightarrow x-654=66:3\\ \Rightarrow x=22+654\\ \Rightarrow x=676\\ c,7^{65}:7^x=7^{43}.7^{21}\\ \Rightarrow7^{65-x}=7^{43+21}\\ \Rightarrow65-x=64\\ \Rightarrow x=65-64\\ \Rightarrow x=1\)
b,21/17x13/14x56x3/42
=21/17x3/42x56x13/14
=21x3/17x42 x 56x13/14
=21x3/17x21x2 x 14x4x13/14
=3/17x2 x 4x13
=3/24 x 52=3x52/24
=3x52/3x8
=52/8=13/2
a, 6/7 x 16/15 x 7/6 x 21/32
=(6/7 x 7/6)x16/15x21/32
=16/15x21/32
=16x21/15x32
=16x3x7/3x5x16x2
=7/5x2=7/10
\(\frac{3}{7}=\frac{x}{56}=\frac{24}{56}=>x=24\)
\(\frac{x}{5}=\frac{21}{35}=\frac{x}{5}=\frac{3}{5}=>x=3\)
\(\frac{42}{54}=\frac{7}{x}=\frac{7}{8}=\frac{7}{x}=>x=8\)
\(\frac{35}{x}=\frac{7}{15}=\frac{35}{x}=\frac{35}{75}=>x=75\)
\(2016x+\left(\dfrac{7}{12}+\dfrac{4}{21}+\dfrac{2}{24}+\dfrac{11}{30}+\dfrac{3}{41}+\dfrac{15}{56}\right)-\left(\dfrac{2}{3}+\dfrac{2}{4}+\dfrac{2}{5}\right)=0\)
\(2016x+\left[\left(\dfrac{7}{12}+\dfrac{2}{24}\right)+\left(\dfrac{4}{21}+\dfrac{11}{30}+\dfrac{3}{41}+\dfrac{15}{56}\right)\right]-\dfrac{47}{30}=0\)
\(2016x+\left(\dfrac{2}{3}+\dfrac{1473}{1640}\right)=0+\dfrac{47}{30}\)
\(2016x+\dfrac{2}{3}+\dfrac{1473}{1640}=\dfrac{47}{30}\)
\(2016x+\dfrac{2}{3}=\dfrac{47}{30}-\dfrac{1473}{1640}\)
\(2016x+\dfrac{2}{3}=\dfrac{3289}{4920}\)
\(2016x=\dfrac{3289}{4920}-\dfrac{2}{3}\)
\(2016x=\dfrac{3}{1640}\)
\(x=\dfrac{3}{1640}:2016\)
\(x=\dfrac{1}{1102080}\)
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\(56-3\left(x-3\right)=21\)
\(\Leftrightarrow56-3x+9=21\)
\(\Leftrightarrow44=3x\)
\(\Leftrightarrow x=\frac{44}{3}\)
\(56-3.\left(x-3\right)=21\)
\(\Rightarrow\) \(3.\left(x-3\right)=35\)
\(\Rightarrow\) \(x-3=\frac{35}{3}\)
\(\Rightarrow\) \(x=\frac{44}{3}\)