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=26/100+9/100+41/100+24/100
=(26+24+9+41)/100
=100/100
=1
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A = \(\dfrac{13}{50}\) + 9% + 41/100 + 0,24
A = 0,26 + 0,09 + 0,41 + 0,24
A = (0,26 + 0,24) + ( 0,09 + 0,41)
A = 0,5 + 0,5
A = 1
`@` `\text {Ans}`
`\downarrow`
`a)`
`13/50 + 9% + 41/100 + 0,24`
`= 0,26 + 0,09 + 0,41 + 0,24`
`= (0,26 + 0,24) + (0,09 + 0,41)`
`= 0,5 + 0,5`
`= 1`
`b)`
`2018 \times 2020 - 1/2017 + 2018 \times 2019`
`= 2018 \times (2020 + 2019) - 1/2017`
`= 2018 \times 4039 - 1/2017`
`= 8150702`
`c)`
`1/2 + 1/6 + 1/12 + 1/20 +1/30 +1/42`
`=`\(\dfrac{1}{1\times2}+\dfrac{1}{2\times3}+\dfrac{1}{3\times4}+\dfrac{1}{4\times5}+\dfrac{1}{5\times6}+\dfrac{1}{6\times7}\)
`=`\(1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{6}-\dfrac{1}{7}\)
`=`\(1-\dfrac{1}{7}\)
`= 6/7`
\(a,\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\\ 0,26+0,09+0,41+0,24\\ =\left(0,26+0,24\right)+\left(0,09+0,41\right)\\ =0,5+0,5\\ =1\\ b,2018\times2020-\dfrac{1}{2017}+2018\times2019\\ =2018\times\left(2020+2019\right)-\dfrac{1}{2017}\\ =2018\times4039-\dfrac{1}{2017}\\ =3150702-\dfrac{1}{2017}\\ c,\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}+\dfrac{1}{20}+\dfrac{1}{30}+\dfrac{1}{42}\\ =1-\dfrac{1}{2}+\dfrac{1}{2\cdot3}+\dfrac{1}{3\cdot4}+\dfrac{1}{4\cdot5}+\dfrac{1}{5\cdot6}+\dfrac{1}{6\cdot7}\\ =1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}.........+\dfrac{1}{6}-\dfrac{1}{7}\\ =1-\dfrac{1}{7}\\ =\dfrac{6}{7}\)
\(\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\)
\(=\dfrac{26}{100}+\dfrac{9}{100}+\dfrac{41}{100}+\dfrac{24}{100}\)
\(=\left(\dfrac{26}{100}+\dfrac{24}{100}\right)+\left(\dfrac{9}{100}+\dfrac{41}{100}\right)\)
\(=\dfrac{1}{2}+\dfrac{1}{2}\)
\(=1\)
13/50 + 9% + 41/100 + 0,24
\(=\frac{26}{100}+\frac{9}{100}+\frac{41}{100}+\frac{24}{100}\)
\(=\frac{26+9+41+24}{100}\)
\(=\frac{\left(26+24\right)+\left(9+41\right)}{100}\)
\(=\frac{50+50}{100}\)
\(=\frac{100}{100}\)
\(=1\)
OK CHÚC BẠN HỌC TỐT !!!
THANK YOU TRƯỚC NHÉ !
13/50 + 9% + 41/100 + 0,24
= 0, 26 + 0, 09 + 0, 41 + 0, 24
= (0, 26 + 0, 24) + ( 0, 09 + 0, 41)
=0, 5 +0, 5
= 1
\(\frac{13}{50}+9\%+\frac{41}{10}+0,24\)
\(=\frac{13}{50}+\frac{9}{100}+\frac{41}{100}+\frac{24}{100}\)
\(=\frac{13}{50}+\left(\frac{9}{100}+\frac{41}{100}+\frac{24}{100}\right)\)
\(=\frac{13}{50}+\frac{74}{100}\)
\(=\frac{13}{50}+\frac{37}{50}=\frac{50}{50}=1\)
=\(\frac{26}{100}\)+\(\frac{9}{100}\)+\(\frac{41}{100}\)+\(\frac{24}{100}\)=(\(\frac{26}{100}\)+\(\frac{24}{100}\)) + ( \(\frac{9}{100}\)+\(\frac{41}{100}\)) =\(\frac{50}{100}\)+\(\frac{50}{100}\)= 1
nho k cho minh nhe
13/50 + 9% + 41/100 + 0,14
= 13/50 + 9/100 + 41/100 + 14/100
= 26/100 + 9/100 + 4/100 + 14/100
= 53/100
Tk và kb hộ mk nha! thanks