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\(\left(\frac{1}{25.26}+\frac{1}{26.27}+...+\frac{1}{29.30}\right)\cdot150+1,03\div\left[1,03\cdot\left(y-1\right)\right]\text{ }=22\)
\(\Rightarrow\left(\frac{1}{25}-\frac{1}{26}+\frac{1}{26}-\frac{1}{27}+...+\frac{1}{29}-\frac{1}{30}\right)\cdot150+1,03\div\left[1,03\cdot\left(y-1\right)\right]=22\)
\(\Rightarrow\left(\frac{1}{25}-\frac{1}{30}\right)\cdot150+1,03\div\left[1,03\cdot\left(y-1\right)\right]=22\)
\(\Rightarrow\frac{1}{150}\cdot150+1,03\div\left[1,03\left(y-1\right)\right]=22\)
\(\Rightarrow1+1,03\div\left[1,03\left(y-1\right)\right]=22\)
\(\Rightarrow1,03\left(y-1\right)=1,03\div\left(22-1\right)\)
\(\Rightarrow1,03y-1,03=1,03\div21\)
\(\Rightarrow1,03y=\frac{103}{2100}+1,03\)
\(\Rightarrow1,03y=\frac{1133}{1050}\)
\(\Rightarrow y=\frac{1133}{1050}\div\frac{103}{100}=\frac{1133}{1050}\cdot\frac{100}{103}=\frac{22}{21}\)
Vậy y = \(\frac{22}{21}\)
Dấu " . " là dấu nhân nhé
\(\left(\frac{1}{25\times26}+\cdot\cdot\cdot+\frac{1}{29\times30}\right)\times150+1\frac{3}{100}:[1\frac{3}{100}\times(y-1)]=22\)
\(\Rightarrow\left(\frac{1}{25}-\frac{1}{26}+\cdot\cdot\cdot+\frac{1}{29}-\frac{1}{30}\right)\times150:\left(y+1\right)=22\)
\(\Rightarrow\left(\frac{1}{25}-\frac{1}{30}\right)\times150:\left(y+1\right)=22\)
\(\Rightarrow\frac{1}{150}\times150:\left(y+1\right)=22\)
\(\Rightarrow1:\left(y+1\right)=22\)
\(\Rightarrow y+1=\frac{1}{22}\)
\(\Rightarrow y=\frac{1}{22}-1=\frac{-21}{22}\)
(4,329:0,001-43,29).150+2017-5:10
=(4329-43,29).150+2017-0,5
=4285,71.150+2016,5
=642856,5+2016,5
=644873
(4,329 : 0,001 - 43,2 x 100) x 150 + 2018 + 2019 : 10000
= (4,329 x 1000 - 4320) x 150 + 2018 + 2019 : 10000
= (4329 - 4320) x 150 + 2018 + 2019 : 10000
= 9 x 150 + 2018 + 0,2019
= 1350 + 2018 + 0,2019
= 3368 + 0,2019
= 3368,2019
(4,329 : 0,001 - 43,29 x 100) x 150 + 2018 + 2019 : 10000
= (4,329 x 1000 - 4329) x 150 + 2018 + 2019 : 10000
= (4329 - 4329) x 150 + 2018 + 2019 : 10000
= 0 x 150 + 2018 + 0,2019
= 0 + 2018 + 0,2019
= 2018 + 0,2019
= 2018,2019
a, x + 27 = 96 + 17
=> x + 27 = 113
=> x = 113 - 27
=> x = 86
b, x - 210 : 21 = 25
=> x - 10 = 25
=> x = 25 + 10
=> x = 35
c, (x + 8,7) . 10,8 = 270
=> x + 8,7 = 270 : 10,8
=> x + 8,7 = 25
=> x = 25 - 8,7
=> x = 16,3
d, 7 . x - 4 . x = 35 - 2
=> 7 . x - 4 . x = 33
=> x . (7 - 4) = 33
=> x . 3 = 33
=> x = 33 : 3
=> x = 11
#) Dấu "." là nhân nhé!
~Study well~
#KSJ
0,8 x 0,04 x 1,25 x 25 x 0,6524 x 0,3476
= ( 0,8 x 1,25 ) x ( 0,04 x 25 ) x ( 0,3476 + 0,5624 )
= 1 x 1 x 0,9
= 1 x 0,9
= 0,9
10 x 125 x 4 x 25 x 8
= 10 x ( 125 x 8 ) x ( 4 x 25 )
= 10 x 1 000 x 100
= 1 000 000
0,8.0,04.1,25.25.0,6524.0,3476
=(0,8.1,25).(0,04.25).(0,3476+0,5624)
=1.1.0,9
=0,9
10.125.4.25.8
=10.(125.8).(4.25)
=10.1 000.100
=1000000
#HỌC TỐT#