-5/19 .8/19 + -14/19 .8/19 -11/19
nhanh lên cần gắp
Những câu hỏi liên quan
B1: Bỏ ngoặc rồi thực hiện phép tính (phân số)
a) (-5/11) - (7/19 - 5/31)
b) - ( 11/14 - 8/19) + (3/14 - 8/19)
B2: Tím số nguyên x, biết
-5/24 - 1/3 < x/24 < -1/8 + 1/3
8/19 • 5/11 + 8/19 • 6/11 + 11/19
sắp xếp các số hữu tỉ sau theo thứ tự tăng dần
a)-12/19;-3/19;-16/19;-1/19;-11/19;-14/19;-9/19
b)-10/9;-10/7;-10/2;-10/4;-10/8;-10/3;-10/11
a, theo thứ tự tăng dần : -16/19;-14/19;-12/19;-11/19;-9/19;-3/19;-1/19
b, theo thứ tự tăng dần :-10/11;-10/9;-10/8;-10/7;-10/4;-10/3;-10/2
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a, theo thứ tự tăng dần : -16/19;-14/19;-12/19;-11/19;-9/19;-3/19;-1/19
b, theo thứ tự tăng dần :-10/11;-10/9;-10/8;-10/7;-10/4;-10/3;-10/2
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Tính :
a) 12 + 3 = 15 + 4 = 8 + 2 = 14 + 3 =
15 - 3 = 19 - 4 = 10 - 2 = 17 - 3 =
b) 11 + 4 + 2 = 19 - 5 - 4 = 14 + 2 - 5 =
a) 12 + 3 = 15 15 + 4 = 19 8 + 2 = 10 14 + 3 = 17
15 - 3 = 12 19 - 4 = 15 10 - 2 = 8 17 - 3 = 14
b) 11 + 4 + 2 = 17 19 - 5 - 4 = 10 14 + 2 - 5 = 11
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8 phần 19× 5 phần 11+ 7 phần 19× 8 phần 11- 8 phần 19× 1 phần 11
=\(\dfrac{8}{19}.\dfrac{5}{11}+\dfrac{7}{19}.\dfrac{8}{11}-\dfrac{8}{19}.\dfrac{1}{11}\)
=\(\dfrac{8}{19}.\dfrac{5}{11}+\dfrac{8}{19}.\dfrac{7}{11}-\dfrac{8}{19}.\dfrac{1}{11}\)
=\(\dfrac{8}{19}.\left(\dfrac{5}{11}+\dfrac{7}{11}-\dfrac{1}{11}\right)\)
=\(\dfrac{8}{19}\).1
=\(\dfrac{8}{19}\)
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Tính
a) -19 - |+13| + |-10| - (-5) - 11
b) ( -10) - (11) + |-5| - |-7| - 8
c) - (-8) - (+7) - |-11| + |+12|
d) -14 - |-18| - (-20) - |-25|
đ) 23 - |-15| - (-17) + |-13|
Nhanh lên voeí ạ !
a) Ta có: \(-19-\left|+13\right|+\left|-10\right|-\left(-5\right)-11\)
\(=-19-13+10+5-11\)
\(=-28\)
b) Ta có: \(\left(-10\right)-\left(11\right)+\left|-5\right|-\left|-7\right|-8\)
\(=-10-11+5-7-8\)
\(=-31\)
c) Ta có: \(-\left(-8\right)-\left(+7\right)-\left|-11\right|+\left|+12\right|\)
\(=8-7-11+12\)
\(=2\)
d) Ta có: \(-14-\left|-18\right|-\left(-20\right)-\left|-25\right|\)
\(=-14-18+20-25\)
\(=-37\)
đ) Ta có: \(23-\left|-15\right|-\left(-17\right)+\left|-13\right|\)
\(=23-15+17+13\)
\(=38\)
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1. TÍNH
5 /7 x 4 : 5/9 =
4/9 : 2 x 5/7 =
8 x 2/3 : 1/2=
2. thực hiện phép tính một cách hợp lí
4/7 : 3/5 : 7/4 - 20 : 5/36 =
7/8 + 1/8 x 3/8 + 1/8 x 5/8 =
3/11 x 7/19 + 2/11 x 17/19 - 3/11 - 24/19 =
3/14 : 7/15 + 2/7 : 15/7 =
hai bài trên các bạn phải giaair chi tiết ra nhé !
mình đang cần gấp
1. TÍNH
`5/7 xx 4 : 5/9 = 5/7 xx 4 xx 9/5 = 20/7 xx 9/5 = 36/7`
`4/9 : 2 xx 5/7 = 4/9 xx 1/2 xx 5/7 = 2/9 xx 10/63 `
`8 xx 2/3 : 1/2= 8xx 2/3 xx 2/1 = 8 xx 2/3 xx 2 = 16/3 xx 2=32/3`
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Tính hợp lý:
a) ( -5/6 + 2/5) : 3/8 + ( 4/5 - 11/30) : 3/8
b) (-3/4 + 2/5) : 3/7 + ( 3/5 + -1/4) : 3/7
c)-13/18 . 5/8 + -5/18 . 2/9 + -13/18 . 3/8 + -5/18 . 7/9
d) -11/19 . 4/9 + -8/19 . 3/7 + -11/19 . 5/9 + -9/19 . 4/7
a: \(\left(-\dfrac{5}{6}+\dfrac{2}{5}\right):\dfrac{3}{8}+\left(\dfrac{4}{5}-\dfrac{11}{30}\right):\dfrac{3}{8}\)
\(=\left(-\dfrac{5}{6}+\dfrac{2}{5}\right)\cdot\dfrac{8}{3}+\left(\dfrac{4}{5}-\dfrac{11}{30}\right)\cdot\dfrac{8}{3}\)
\(=\dfrac{8}{3}\left(-\dfrac{5}{6}+\dfrac{2}{5}+\dfrac{4}{5}-\dfrac{11}{30}\right)\)
\(=\dfrac{8}{3}\cdot\dfrac{-25+36-11}{30}\)
=0
b: \(\left(-\dfrac{3}{4}+\dfrac{2}{5}\right):\dfrac{3}{7}+\left(\dfrac{3}{5}+\dfrac{-1}{4}\right):\dfrac{3}{7}\)
\(=\left(-\dfrac{3}{4}+\dfrac{2}{5}\right)\cdot\dfrac{7}{3}+\left(\dfrac{3}{5}-\dfrac{1}{4}\right)\cdot\dfrac{7}{3}\)
\(=\dfrac{7}{3}\left(-\dfrac{3}{4}+\dfrac{2}{5}+\dfrac{3}{5}-\dfrac{1}{4}\right)\)
\(=\dfrac{7}{3}\cdot0=0\)
c: \(\dfrac{-13}{18}\cdot\dfrac{5}{8}+\dfrac{-5}{18}\cdot\dfrac{2}{9}+\dfrac{-13}{18}\cdot\dfrac{3}{8}+\dfrac{-5}{18}\cdot\dfrac{7}{9}\)
\(=\left(-\dfrac{13}{18}\cdot\dfrac{5}{8}+\dfrac{-13}{18}\cdot\dfrac{3}{8}\right)+\left(-\dfrac{5}{18}\cdot\dfrac{2}{9}+\dfrac{-5}{18}\cdot\dfrac{7}{9}\right)\)
\(=-\dfrac{13}{18}\left(\dfrac{5}{8}+\dfrac{3}{8}\right)+\dfrac{-5}{18}\left(\dfrac{2}{9}+\dfrac{7}{9}\right)\)
\(=-\dfrac{13}{18}-\dfrac{5}{18}=-\dfrac{18}{18}=-1\)
d: Sửa đề: \(\dfrac{-11}{19}\cdot\dfrac{4}{9}+\dfrac{-8}{19}\cdot\dfrac{3}{7}+\dfrac{-11}{19}\cdot\dfrac{5}{9}+\dfrac{-8}{19}\cdot\dfrac{4}{7}\)
\(=\left(-\dfrac{11}{19}\cdot\dfrac{4}{9}+\dfrac{-11}{19}\cdot\dfrac{5}{9}\right)+\left(\dfrac{-8}{19}\cdot\dfrac{3}{7}+\dfrac{-8}{19}\cdot\dfrac{4}{7}\right)\)
\(=-\dfrac{11}{19}\left(\dfrac{4}{9}+\dfrac{5}{9}\right)+\dfrac{-8}{19}\left(\dfrac{3}{7}+\dfrac{4}{7}\right)\)
\(=-\dfrac{11}{19}-\dfrac{8}{19}=-\dfrac{19}{19}=-1\)
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\(a.\left(-\dfrac{5}{6}+\dfrac{2}{5}\right):\dfrac{3}{8}+\left(\dfrac{4}{5}-\dfrac{11}{30}\right):\dfrac{3}{8}\)
\(=\left(-\dfrac{13}{30}\right):\dfrac{3}{8}+\dfrac{13}{30}:\dfrac{3}{8}\)
\(=\left[\left(-\dfrac{13}{30}+\dfrac{13}{30}\right)\right]:\dfrac{3}{8}\)
\(=0:\dfrac{3}{8}=0\)
\(b.\left(-\dfrac{3}{4}+\dfrac{2}{5}\right):\dfrac{3}{7}+\left(\dfrac{3}{5}+-\dfrac{1}{4}\right):\dfrac{3}{7}\)
\(=\left(-\dfrac{7}{20}\right):\dfrac{3}{7}+\dfrac{7}{20}:\dfrac{3}{7}\)
\(=\left[\left(-\dfrac{7}{20}+\dfrac{7}{20}\right)\right]:\dfrac{3}{7}=0:\dfrac{3}{7}=0\)
\(c.-\dfrac{13}{18}.\dfrac{5}{8}+-\dfrac{5}{18}.\dfrac{2}{9}+-\dfrac{13}{18}.\dfrac{3}{8}+-\dfrac{5}{18}.\dfrac{7}{9}\)
\(=\left(\dfrac{5}{8}+\dfrac{3}{8}\right).-\dfrac{13}{18}+\left(\dfrac{2}{9}+\dfrac{7}{9}\right).-\dfrac{5}{18}\)
\(=1.-\dfrac{13}{18}+1.-\dfrac{5}{18}=-\dfrac{13}{18}+-\dfrac{5}{18}=-1\)
\(d.-\dfrac{11}{19}.\dfrac{4}{9}+\dfrac{-8}{19}.\dfrac{3}{7}+-\dfrac{11}{19}.\dfrac{5}{9}+-\dfrac{9}{19}.\dfrac{4}{7}\)
\(=\left(\dfrac{4}{9}+\dfrac{5}{9}\right).-\dfrac{11}{19}+-\dfrac{24}{133}+-\dfrac{36}{133}\)
\(=-\dfrac{11}{19}+-\dfrac{60}{133}=-\dfrac{137}{133}\)
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-3/-7+5/19+-8/14;-13/22+-8/-11+-42/56