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(x-2):2*3=6
(x-2):2=6:3=2
(x-2)=2.2=4
x=4+2
x=6
b)
194-24:(12:3.x-3)-25=145
194-24:(12:3.x-3)=145+25=170
194-170=24:(12:3.x-3)
24=24:(12:3.x-3)
=> 12:3.x-3=1
=> 12:3.x=4
=>4x=4
=>x=1
\(a) (x-2):2.3=6\)
\( (x-2):2=6:3\)
\((x-2):2=2\)
\(x-2=2.2\)
\(x-2=4\)
\(x=4+2\)
\(x=6\). Vậy x=6
\(b)194-24:(42:3.x-3)-25=145\)
\(194-24:(42:3x-3)=145+25\)
\(194-24:(42:3x-3)=170\)
\(24:(42:3x-3)=194-170\)
\(24:(42:3x-3)=24\)
\(42:3x-3=24:24\)
\(42:3x-3=1\)
\(3x-3=42\)
\(3x=45\)
\(x=15\). Vậy x=15
~ Hok tốt nhé A.R.M.Y~ ^^
a)1999*2000-1:1998+1999*2000=[(1999*2000)-(1999*2000)] va 1:1998
=0 + 1998
=1998
\(A=19\frac{1}{4}+\frac{1}{2}\times2\frac{1}{3}+5,75-\frac{1}{6}+74\)
MK GHI ĐẦY ĐỦ RA RÙI, BẠN TỰ BẤM MÁY TÍNH LÀM NHA ( MÌNH LƯỜI )
\(A=19\frac{1}{4}+\frac{1}{2}\times2\frac{1}{3}+5,75-\frac{1}{6}+74\)
\(A=\frac{77}{4}+\frac{1}{2}\times\frac{7}{3}+\frac{23}{4}-\frac{1}{6}+74\)
\(A=\frac{77}{4}+\frac{7}{6}+\frac{23}{4}-\frac{1}{6}+74\)
\(A=(\frac{77}{4}+\frac{23}{4})+(\frac{7}{6}-\frac{1}{6})+74\)
\(A=25+1+74\)
\(A=26+74\)
\(A=100\)
a, \(5\frac{3}{4}:\frac{5}{6}-3\frac{3}{4}:\frac{5}{6}\)
\(=\left(5\frac{3}{4}-3\frac{3}{4}\right):\frac{5}{6}\)
\(=2\frac{3}{4}:\frac{5}{6}\)
\(=\frac{11}{4}.\frac{6}{5}\)
\(=\frac{66}{20}\)
\(=\frac{33}{10}\)
b, \(\frac{4}{5}.\frac{22}{47}+\frac{25}{47}:\frac{5}{4}\)
\(=\frac{4}{5}.\frac{22}{47}+\frac{25}{47}.\frac{4}{5}\)
\(=\frac{4}{5}.\left(\frac{22}{47}+\frac{25}{47}\right)\)
\(=\frac{4}{5}.1\)
\(=\frac{4}{5}\)
a) 5\(\frac{3}{4}\) : \(\frac{5}{6}\) - 3\(\frac{3}{4}\) : \(\frac{5}{6}\)
= ( 5\(\frac{3}{4}\) - 3\(\frac{3}{4}\) ) : \(\frac{5}{6}\)
= 2 : \(\frac{5}{6}\) = \(\frac{12}{5}\)
b) \(\frac{4}{5}\) x \(\frac{22}{47}\)+ \(\frac{25}{47}\) : \(\frac{5}{4}\)
= \(\frac{4}{5}\) x \(\frac{22}{47}\) + \(\frac{25}{47}\) x \(\frac{4}{5}\)
= \(\frac{4}{5}\) x ( \(\frac{22}{47}\) + \(\frac{25}{47}\) )
= \(\frac{4}{5}\) x 1 = \(\frac{4}{5}\)
\(\frac{x}{3\frac{1}{2}.2\frac{2}{3}}=\frac{9}{56}\Rightarrow\frac{x}{\frac{7}{2}.\frac{8}{3}}=\frac{9}{56}\Rightarrow x=\frac{9}{56}.\frac{28}{3}=\frac{3}{2}\)
\(x:\left(3\frac{1}{2}.2\frac{2}{3}\right)=\frac{9}{56}\)
\(x:\left(\frac{7}{2}.\frac{8}{3}\right)=\frac{9}{56}\)
\(x:\left(\frac{7.4}{3}\right)=\frac{9}{56}\)
\(x.\frac{3}{28}=\frac{9}{56}\)
\(x=\frac{9}{56}.\frac{28}{3}=\frac{3}{2}\)
Vậy \(x=\frac{3}{2}\)
a ) 5x-2 - 32 = 24 - ( 28 . 24 - 210 . 22 )
5x-2 - 9 = 16 - ( 256 . 16 - 1024 . 4 )
5x-2 - 9 = 16 - ( 4096 - 4096 ) = 16 - 0
5x-2 = 16 + 9 = 25 nhưng\(\sqrt{25}=5^2\)x = 2 + 2 = 4
b ) b ) 697 : [( 15 x + 364 ) : x ] = 17
mình ko hiểu đề cho lắm
a,12 b,39
c,31 d,4
e,31
a) 71 - ( 33 + x ) = 26
33 + x = 71 - 26
33 + x = 45
x = 45 - 33
x = 12
b) ( x + 73 ) - 26 = 76
x + 73 = 76 + 26
x + 73 = 102
x = 102 - 73
x = 29
c) 45 - ( x + 9 ) = 6
x + 9 = 45 - 6
x + 9 = 39
x = 39 - 9 = 30
d) 89 - ( 73 - x ) = 20
73 - x = 89 - 20
73 - x = 69
x = 73 - 69
x = 4
e) ( x + 7 ) - 25 = 13
x + 7 = 13 + 25
x + 7 = 38
x = 38 - 7
x = 31