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vì x là số tự nhiên nên =540:(x-6)nên x-6=1mà 1+6=7 nên x=7
p là 2004+540=2454
nhớ nhe hihi
\(B=\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)\left(1-\frac{1}{5}\right)\cdot....\cdot\left(1-\frac{1}{2003}\right)\left(1-\frac{1}{2004}\right)\)
\(=\frac{2}{3}\cdot\frac{3}{4}\cdot\frac{4}{5}\cdot....\cdot\frac{2002}{2003}\cdot\frac{2003}{2004}\)
\(=\frac{2\cdot3\cdot4\cdot...\cdot2002\cdot2003}{3\cdot4\cdot5\cdot...\cdot2003\cdot2004}=\frac{1}{1002}\)
B= (1-1/2). ( 1-1/3).(1-1/4).(1-1/5)....(1-1/2004)
B= 1/2. 2/3 . 3/4. 4/5....2003/2004
B= 1/2004
\(B=\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)...\left(1-\frac{1}{2003}\right)\left(1-\frac{1}{2004}\right)\)
\(B=\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot...\cdot\frac{2002}{2003}\cdot\frac{2003}{2004}\)
\(B=\frac{1}{2004}\)
\(5\times2,54+12\times0,05-9\times5,06\)
\(=12,7+0,6-45,54\)
\(=13,3-45,54\)
\(=-32,24\)
Vậy \(5\times2,54+12\times0,05-9\times5,06=-32,24\)
5 x 2,54 + 12 x 0,05 - 9 x 5,06
= 12,7 + 0,6 - 45,54
= 13,3 - 45,54
= -32,24
#Học tốt#
b) X x 3,7 + X x 6,3 = 120 |
X x ( 3,7 + 6,3 ) = 120
X x 10 = 120
X = 120 : 10
X = 12
Vậy X = 12
\(x:0,25+6.x=12,81+7,19\)
\(x.4+6.x=20\)
\(x.\left(4+6\right)=20\)
\(x.10=20\)
\(x=20:10\)
\(x=2\)
~ Hok tốt ~
\(x:0,25+6\times x=12,81+7,19\)
\(\Leftrightarrow x:\frac{25}{100}+6\times x=20\)
\(\Leftrightarrow x:\frac{1}{4}+6\times x=20\)
\(\Leftrightarrow x\times4+6\times x=20\)
\(\Leftrightarrow x\times(4+6)=20\)
\(\Leftrightarrow x\times10=20\)
\(\Leftrightarrow x=20:10=2\)
Vậy x = 2
5 x ( 4 + 6 x X ) = 290
20 + 30 x X = 290
30 x X = 270
X = 9
\(5\left(4+6.x\right)=290\)
\(\Leftrightarrow4+6x=290:5\)
\(\Leftrightarrow4+6x=58\)
\(\Leftrightarrow6x=54\)
\(\Leftrightarrow x=54:6\)
\(\Leftrightarrow x=9\)