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\(\dfrac{22}{5}\times\dfrac{6}{121}\times\dfrac{11}{4}\times\dfrac{3}{5}\times\dfrac{1}{3}\times\dfrac{5}{4}\)
\(=\left(\dfrac{22}{5}\times\dfrac{5}{4}\right)\times\left(\dfrac{6}{121}\times\dfrac{11}{4}\right)\times\left(\dfrac{3}{5}\times\dfrac{1}{3}\right)\)
\(=\dfrac{11}{2}\times\dfrac{3}{22}\times\dfrac{1}{5}\)
\(=\dfrac{3}{20}\)
\(=\dfrac{22\times6\times11\times3\times1\times5}{5\times121\times4\times5\times3\times4}=\dfrac{11\times2\times6\times11\times1}{11\times11\times4\times5\times4}=\dfrac{2\times6\times1}{4\times5\times4}=\dfrac{18}{100}=\dfrac{9}{50}\)
\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}:\dfrac{4}{3}=\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}\times\dfrac{3}{4}=\dfrac{462}{187}\times\dfrac{204}{252}=\dfrac{42}{17}\times\dfrac{17}{21}=\dfrac{2}{1}=2\)
21/11 x 22/17 x 68/63 : 4/3
=( 21/11 x 22/17) x (68/63 : 4/3)
= 42/17 x 17/21
= 2/1 = 2
\(3\left(x+4\right)+2\left(x-1\right)-3=22\)
\(\Leftrightarrow3x+12+2x-2-3=22\)
\(\Leftrightarrow5x-15=0\Leftrightarrow x=3\)
Vậy x = 3
\(3\left(x+4\right)+2\left(x-1\right)-3=22\)
\(3x+12+2x-2-3=22\)
\(5x-7=22\)
\(5x=22+7\)
\(5x=29\)
\(x=\frac{29}{5}=5,8\)
34,65 + 21,78 + 65,35 + 78,22
= (34,65 + 65,35) + (21,78 + 78,,22)
= 100 + 100
= 200
4,5 x 5,5 + 4,7 x 4,5
= 4,5 x (5,5 + 4,5)
= 4,5 x 10
= 45
7,5 x 2,5 x 4
= 7,5 x 10
= 75
\(34,65+21,78+65,35+78,22=\)
\(=\left(34,65+65,35\right)+\left(21,78+78,22\right)\)
\(=100+100\)
\(=200\)
\(4,5\times5,5+4,7\times4,5=\)
\(=4,5\times\left(5,5+4,7\right)\)
\(=4,5\times10,2\)
\(=45,9\)
\(7,5\times2,5\times4=\)
\(=7,5\times\left(2,5\times4\right)\)
\(=7,5\times10\)
\(=75\)
\(\left(x-12,5\right):\frac{3}{4}=\frac{8}{5}\)
\(x-12,5=\frac{8}{5}.\frac{3}{4}\)
\(x-12,5=\frac{6}{5}\)
\(x=\frac{6}{5}+12,5\)
\(x=\frac{137}{10}\)
\(\left(x-\frac{2}{5}\right)\times\frac{5}{11}=\frac{75}{22}\)
\(x-\frac{2}{5}=\frac{75}{22}:\frac{5}{11}\)
\(x-\frac{2}{5}=\frac{15}{2}\)
\(x=\frac{15}{2}+\frac{2}{5}\)
\(x=\frac{79}{10}\)
khỏi chép đề nha
a\Câu 1:
200 : ( 15 - x ) = 15 + 5
200 : ( 15 - x ) = 20
15 - x = 200 : 20
15 - x = 10
x = 15 - 10
x = 5
Câu 2:
63 : ( x - 5 ) = 22 -1
63 : ( x - 5 ) = 21
x - 5 = 63 : 21
x - 5 = 3
x = 3 + 5
x = 8
<=> x=\(4-\dfrac{22}{3}\)
<=> x=\(\dfrac{12-22}{3}\)
<=> x=\(\dfrac{-10}{3}\)
x = 22/3-4
x = 10/3.