a) 3(4-x) +2=3/8
3(4-x) =3/8 - 2
3(4-x) = -13/8
4-x= -13/8 : 3
4-x =-13/24
b)(x-1/2)2=1/4
(x-1/2)2=(1/2)2
=>x-1/2=1/2
x=1/2+1/2
x=1
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Tìm x biết:
a)\(\frac{2}{3}.\left(x-\frac{3}{8}\right)-x-\left(-\frac{7}{8}+\frac{2}{3}\right)=\left(\frac{-3}{4}\right)^3:1\frac{11}{16}\)
b)\(-\frac{7}{8}+\frac{7}{8}:\left(\frac{2}{3}-x\right)+\frac{5}{6}:\left(-1\frac{11}{35}\right)=\left(0,8\right)^2\)
Tìm x biết :
a)\(\frac{2}{3}x-50\%x-\left(-\frac{4}{5}\right):1\frac{3}{5}=-0,12\)\(+1\frac{3}{25}\)
b)\(\left(-1\frac{1}{6}+\frac{2}{3}-\frac{3}{4}\right):x+\left(-1\frac{11}{12}\right).1\frac{21}{23}=-6\frac{1}{3}\)
c)\(50\%x-\frac{1}{3}x-\left(\frac{-2}{3}\right)^2.\left(-1\frac{1}{8}\right)=-119\frac{3}{4}+120\frac{5}{6}\)
Tìm x, biết:
a)\(-\frac{2}{3}\left(x-\frac{1}{4}\right)=\frac{1}{3}\left(2x-1\right)\)
b) \(\frac{1}{5}.2^x+\frac{1}{3}.2^{x+1}=\frac{1}{5}.2^7+\frac{1}{3}.2^8\)
Bài 1:Thực hiện phép tínha,75%-1frac{1}{2}+0,5:frac{5}{12}-left(frac{-1}{2}right)^2 b,left(frac{5}{7}.0,6-5:3frac{1}{2}right).left(40%-1,4right).left(-2right)^3Bài 2: Tính nhanh left(frac{-4}{5}+frac{4}{3}right)+left(frac{-5}{4}+frac{14}{5}right)-frac{7}{3}Bài 3:Tìm x biếta,frac{-2}{3}-frac{1}{3}.left(2x-5right)frac{3}{2} b,frac{2}{5}.x+frac{1}{2}frac{-3}{4} frac{1}{3}.x-8frac{1}{2} x-frac{1}{4}frac{5}{8}.frac{2}{3}Bài 4: Tìm...
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Bài 1:Thực hiện phép tính
\(a,75\%-1\frac{1}{2}+0,5:\frac{5}{12}-\left(\frac{-1}{2}\right)^2\) \(b,\left(\frac{5}{7}.0,6-5:3\frac{1}{2}\right).\left(40\%-1,4\right).\left(-2\right)^3\)
Bài 2: Tính nhanh
\(\left(\frac{-4}{5}+\frac{4}{3}\right)+\left(\frac{-5}{4}+\frac{14}{5}\right)-\frac{7}{3}\)
Bài 3:Tìm x biết
\(a,\frac{-2}{3}-\frac{1}{3}.\left(2x-5\right)=\frac{3}{2}\) \(b,\frac{2}{5}.x+\frac{1}{2}=\frac{-3}{4}\) \(\frac{1}{3}.x-8=\frac{1}{2}\) \(x-\frac{1}{4}=\frac{5}{8}.\frac{2}{3}\)
Bài 4: Tìm x biết
\(a,\left(\frac{3}{4}.x+2\frac{1}{2}\right).\frac{-2}{3}=\frac{1}{8}\) \(b,\frac{1}{3}.x-0,5=0,75\)
Bài 5: Tìm x biết
\(a,\frac{2}{5}+\frac{3}{5}.\left(3x-3,7\right)=-\frac{53}{10}\) \(b,5,2.x+7\frac{2}{5}=6\frac{3}{4}\) \(2,4:\left(\frac{-1}{2}-x\right)=1\frac{3}{5}\)
Bài 6:Tìm số tự nhiên x,biết: \(\left(x-5\right).\frac{30}{100}=\frac{20.x}{100}+5\)
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Tìm x
\(\frac{5}{2}-\left(\frac{3}{2}-2\frac{1}{3}+x\right)=\frac{8}{15}-\left(\frac{1}{4}-\frac{7}{10}\right)\)
\(1\frac{2}{3}-1\frac{3}{5}+x=\frac{2}{5}-\left|\frac{3}{4}-\frac{7}{8}\right|\)
\(2-\left(\frac{2}{3}-3\frac{1}{4}+x\right)=1\left|\frac{1}{6}-\frac{13}{12}\right|\)
2.Tìm x
a) \(\frac{a}{b}x-\frac{7}{8}=\frac{1}{4}\)
b)\(\frac{3}{2}x-\frac{1}{2}=\frac{1}{3}:\left(\frac{-5}{6}\right)\)
c)\(\frac{2}{3}\left(x+\frac{5}{4}\right)-\frac{1}{3}\left(\frac{2}{3}-x\right)=\frac{4}{3}\)
Tìm x biết: \(1.\frac{1}{30}:\left(24.\frac{1}{6}-24.\frac{1}{5}\right)-\frac{1.\frac{1}{2}-\frac{3}{4}}{4.x-\frac{1}{2}}=\left(-1.\frac{1}{15}\right):\left(8.\frac{1}{5}-8.\frac{1}{3}\right)\)
1. tìm x biết:
a, \(\left(\frac{2}{3}+x\right)\frac{1}{2}-\frac{1}{3}x=\frac{5}{4}\)
b,\(\left|x+\frac{1}{2}\right|+\frac{1}{2}=\left|\frac{2}{3}-\frac{5}{4}\right|\)
c,\(\left(x+\frac{2}{3}\right)^2.\frac{1}{2}=1\frac{1}{2}\)
Tìm x biết:
a) \(-4\frac{3}{5}.2\frac{4}{23}
Tìm số nguyên x , biết :
a) \(3\frac{2}{3}.\left(\frac{1}{5}-\frac{1}{2}\right)< x< \frac{3}{11}.\left(\frac{1}{5}+\frac{2}{3}-\frac{1}{2}\right)\)
b) \(4,85-\left(3\frac{1}{8}+1,105\right)< x< 91-\left(6,85-2\frac{3}{4}\right)\)