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<=>x.1+x.3/2+x.7/2=252
x.(1+3/2+7/2)=252
x.6=252
x=252:6
=>x=42
Xx11/5-Xx4/7=5/77
Xx(11/5-4/7)=5/77
Xx57/35=5/77
x=5/77:57/35=25/627
Giúp em bài toán này với :
Bài 3: Tìm x :
b) X x \(\frac{1}{2}\)+ \(\frac{3}{2}\)x X = \(\frac{4}{5}\)
\(x.\frac{1}{2}+\frac{3}{2}.x=\frac{4}{5}\)
\(\Rightarrow x\left(\frac{1}{2}+\frac{3}{2}\right)=\frac{4}{5}\)
\(\Rightarrow x.1=\frac{4}{5}\)
\(\Rightarrow x=\frac{4}{5}\)
\(x+x\div5+x\div2=34\)
\(\Leftrightarrow x+x.\frac{1}{5}+x.\frac{1}{2}=34\)
\(\Leftrightarrow x\left(1+\frac{1}{5}+\frac{1}{2}\right)=34\)
ez rồi, tự giải tiếp
x + x : 5 + x: 2 = 34
x + x: ( 5 + 2 ) = 34
x + x : 7 = 34
x + x = 34 * 7
2x = 238
x = 238 : 2
x = 119
Câu 2.
=>x +4<11
=>x=0;1;2;3;4;5;6
=>x +4>9
=>x=6;7;8;9;...
=> x=6
3 - ( 5\(\frac{3}{8}\)+ x - 7\(\frac{5}{24}\)) : 16\(\frac{2}{3}\)= 2
3 - ( \(\frac{43}{8}\)+ x - \(\frac{173}{24}\)) : \(\frac{50}{3}\)= 2
3 - ( \(\frac{43}{8}\)+ x - \(\frac{173}{24}\)) = 2 x \(\frac{50}{3}\)
3 - ( \(\frac{43}{8}\)+ x - \(\frac{173}{24}\)) = \(\frac{100}{3}\)
\(\frac{43}{8}\)+ x - \(\frac{173}{24}\)= 3 - \(\frac{100}{3}\)
\(\frac{43}{8}\)+ x - \(\frac{173}{24}\)= \(-\frac{97}{3}\)
\(\frac{43}{8}\)+ x = \(-\frac{97}{3}+\frac{173}{24}\)
\(\frac{43}{8}\)+ x = \(-\frac{201}{8}\)
x = \(-\frac{201}{8}-\frac{43}{8}\)
x = \(=-\frac{61}{2}\)
\(8,75\cdot x+1,25\cdot x=20\)
\(\left(8,75+1,25\right)\cdot x=20\)
\(10\cdot x=20\)
\(x=20:10\)
\(x=2\)
=>\(x\)x(8,75+1,25)=20
=>\(x\)x10=20
=>\(x\) =20:10
=>\(x\) =2
\(34,8:x+17,2:x=3,2\)
\(34,8\times1:x+17,2\times1:x=3,2\)
\(\left(34,8+17,2\right)\times\left(1:x\right)=3,2\)
\(52\times\left(1:x\right)=3,2\)
\(1:x=3,2:52\)
\(x=1:\left(3,2:52\right)\)
\(x=16,25\)
\(34,8:x+17,2:x=3,2\)
\(x:\left(34,8+17,2\right)=3,2\)
\(x:52=3,2\)
\(x=3,2\) x \(52\)
\(x=166,4\)