Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Bài 3
a,26/100+0,009+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,9+1/4+6+2/7+7+3/5+8+2/3+2/5+1/3+5/7+3/4
(9+6+7+8)+(2/7+5/7)+(1/4+3/4)+(3/5+2/5)+(2/3+1/3)
30+1+1+1+1
=34
Bài 4,5 khó quá mik ko bít lamf^^))
Bài 4: a, \(\dfrac{2008}{2009}\) < 1; \(\dfrac{10}{9}\) > 1
\(\dfrac{2008}{2009}\) < \(\dfrac{10}{9}\)
b, \(\dfrac{1}{a+1}\) và \(\dfrac{1}{a-1}\)
Ta có: a + 1 > a - 1 ⇒ \(\dfrac{1}{a+1}\) < \(\dfrac{1}{a-1}\)
`@` `\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`
\(a,\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\\ 0,26+0,09+0,41+0,24\\ =\left(0,26+0,24\right)+\left(0,09+0,41\right)\\ =0,5+0,5\\ =1\\ b,2018\times2020-\dfrac{1}{2017}+2018\times2019\\ =2018\times\left(2020+2019\right)-\dfrac{1}{2017}\\ =2018\times4039-\dfrac{1}{2017}\\ =3150702-\dfrac{1}{2017}\\ c,\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}+\dfrac{1}{20}+\dfrac{1}{30}+\dfrac{1}{42}\\ =1-\dfrac{1}{2}+\dfrac{1}{2\cdot3}+\dfrac{1}{3\cdot4}+\dfrac{1}{4\cdot5}+\dfrac{1}{5\cdot6}+\dfrac{1}{6\cdot7}\\ =1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}.........+\dfrac{1}{6}-\dfrac{1}{7}\\ =1-\dfrac{1}{7}\\ =\dfrac{6}{7}\)
13/50+9%+41/100+0,24
= 25/100+9/100+41/100+24/100
= 25+9+41+24/100
= 99/100
Nhớ tích cho mình nhé !
\(\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\)
\(=\dfrac{26}{100}+\dfrac{9}{100}+\dfrac{41}{100}+\dfrac{24}{100}\)
\(=\dfrac{26+9+41+24}{100}=1\)
13/50 + 9% + 41/100 + 0,24
=26/100+9/100+41/100+24/100
=100/100
=1
mình nhanh nhất đó nha ^^
đáp số:1
mik mới học mong chỉ dạy nhiều hơn
xin cảm ơn!
\(\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\)
\(=0,26+0,09+0,41+0,24\)
\(=\left(0,26+0,24\right)+\left(0,09+0,41\right)\)
\(=0,5+0,5\)
\(=1\)
\(\dfrac{13}{50}+9\%+\dfrac{41}{100}+0,24\)
\(\dfrac{13}{50}+\dfrac{9}{100}+\dfrac{41}{100}+\dfrac{24}{100}\)
\(\dfrac{13}{50}+\left(\dfrac{9+41+24}{100}\right)\)
\(\dfrac{13}{50}+\dfrac{74}{100}\)
\(\dfrac{26}{100}+\dfrac{74}{100}=\dfrac{100}{100}=1\)
\(0,24\times50-\dfrac{2}{9}:\dfrac{1}{8}\)
\(=\dfrac{6}{25}\times50-\dfrac{2}{9}\times8\)
\(=12-\dfrac{16}{9}\)
\(=\dfrac{108}{9}-\dfrac{16}{9}\)
\(=\dfrac{92}{9}\)
0,24 x 50 - 2/9 : 1/8
= 12 - 2/9 : 1/8
= 12 - 16/9
= 108/9 - 16/9
= 92/9
#nhw_quinh