5/18< .../25<6/18
75:25= ( 75:.... ): ( 25:5 )=.................
90:18= ( 90:9 ): ( 18:9 )=.................
`75:25=(75:5):(25:5)=15:5`
`90:18=(90:9):(18:9)=10:2`
9/25.x+3/5.(9/25+18)+9/25.x+18=x
Tìm x
4) 87+(-45)-(-79)
5) (-15)+45-62
6) 120: (-5)+72
7) -147-130: (-13)
8) 125. (-8) : (-25). (-7)
9) 25-18+(-43)
10) -18-3.(-20)
4) 121
5) - 32
6) 48
7) - 137
8) - 280
9) - 36
10) 42
4) 41
5) -32
6) 48
7) -137
8) -280
9) -36
10) 42
viết các phân số sau theo thứ tự từ bé đến lớn
a) 11/15; 17/18 ; 7/18; 21/18 ;25/18.
b)23/15; 23/17; 23/10 ;23/25; 23/9.
c) 2/3 ;5/7 ; 5/6 ;8/7 ;3/2
Ai rảnh mà làm hộ mày, ngu như con chó mới không biết làm
mày bảo tao ngu mày cũng ngu thế thôi câm mồm đi
đéo làm đc cứ thích sĩ
a, 1\(\dfrac{5}{18}\)+\(\dfrac{7}{25}\)-\(\dfrac{5}{18}\)+\(\dfrac{18}{25}\)-0, 75
b, \(\dfrac{2}{5}\).\(\dfrac{1}{3}\)-\(\dfrac{4}{3}\).\(\dfrac{2}{5}\)
c, (\(\dfrac{-1}{4}\)).( 6\(\dfrac{2}{11}\)) + 3 \(\dfrac{9}{11}\).(\(\dfrac{-1}{4}\))
d, 4. (-\(\dfrac{1}{2}\))\(^{3_{ }}\)-\(_{ }\)2. (\(\dfrac{-1}{2}\))\(^2\) + 3. (\(\dfrac{-1}{2}\)) + 1
e, \(\dfrac{1}{6}\)-(\(\dfrac{2}{3}\))\(^2\) + \(\dfrac{5}{18}\)
f, (\(\dfrac{4}{3}\)-\(\dfrac{3}{2}\))\(^2\)- 2.|-\(\dfrac{1}{9}\)| + (-\(\dfrac{5}{18}\))
e: \(=\dfrac{1}{6}-\dfrac{4}{9}+\dfrac{5}{18}=\dfrac{3-8+5}{18}=0\)
\(\frac{9}{25}x+\frac{3}{5}\left(\frac{9}{25}x+18\right)+\frac{9}{25}x+18=x\)
Ta có \(\frac{9}{25}x+\frac{3}{5}.\frac{9}{25}x+\frac{3}{5}.18+\frac{9}{25}x+18=x\)
=> \(\frac{9}{25}x\left(1+\frac{3}{5}+1\right)+18\left(\frac{3}{5}+1\right)=x\)
=> \(\frac{117}{125}x+28,8=x\)
=> \(x-\frac{117}{125}x=28,8\)
=> \(\frac{8}{125}x=28,8\)
=> x = 450
Vậy x = 450
\(\frac{9}{25}x+\frac{3}{5}.\frac{9}{25}x+\frac{3}{5}.18+\frac{9}{25}x+18=x\)
\(x\left(\frac{9}{25}+\frac{9}{25}+\frac{9}{25}\right).\frac{3}{5}+\frac{3}{5}.18+18=x\)
\(x.\frac{3}{5}\left(\frac{27}{25}+18\right)+18=x\)
\(x.\frac{3}{5}\left(\frac{27}{25}+\frac{450}{25}\right)+18=x\)
\(x.\frac{3}{5}.\frac{477}{25}+18=x\)
\(x.\frac{1431}{125}+\frac{2250}{125}=x\)
\(x.\frac{3681}{125}=x\)
vậy chac tui làm sai rồi
a)8/9-5/9=...
18/25-13/25=...
7/5-4/5=...
36/41-37/41=...
\(\dfrac{8}{9}-\dfrac{5}{9}=\dfrac{3}{9}=\dfrac{1}{3}\)
\(\dfrac{18}{25}-\dfrac{13}{25}=\dfrac{5}{25}=\dfrac{1}{5}\)
\(\dfrac{7}{5}-\dfrac{4}{5}=\dfrac{3}{5}\)
\(\dfrac{36}{41}-\dfrac{37}{41}=-\dfrac{1}{41}\)
\(\dfrac{8}{9}-\dfrac{5}{9}=\dfrac{8-5}{9}=\dfrac{3}{9}=\dfrac{1}{3}\)
\(\dfrac{18}{25}-\dfrac{13}{25}=\dfrac{18-13}{25}=\dfrac{5}{25}=\dfrac{1}{5}\)
\(\dfrac{7}{5}-\dfrac{4}{5}=\dfrac{7-4}{5}=\dfrac{3}{5}\)
\(\dfrac{36}{41}-\dfrac{37}{41}=\dfrac{36-37}{41}\) (câu này hình như lỗi đề em nhé, vì lớp 4 chưa học số âm)
\(\dfrac{8}{9}-\dfrac{5}{9}=\dfrac{3}{9}=\dfrac{1}{3}\)
\(\dfrac{18}{25}-\dfrac{13}{25}=\dfrac{5}{25}=\dfrac{1}{5}\)
\(\dfrac{7}{5}-\dfrac{4}{5}=\dfrac{3}{5}\)
\(\dfrac{36}{41}-\dfrac{37}{41}=\dfrac{-1}{41}\)
Hãy diền dấu lón bé bằng vói các phân số 5/8 vá 8/11 , 7/9 và 5/8 , 12/18 và 18/27 , 25/36 và 25/63
5/8<8/11
7/9>5/8
12/18=18/27
25/36>25/63
7/25+18/25+4/23+5/7+19/23
\(\frac{7}{25}+\frac{18}{25}+\frac{4}{23}+\frac{5}{7}+\frac{19}{23}\)
\(=\left(\frac{7}{25}+\frac{18}{25}\right)+\left(\frac{4}{23}+\frac{19}{23}\right)+\frac{5}{7}\)
\(=1+1+\frac{5}{7}\)
\(=2+\frac{5}{7}=\frac{19}{7}\)