tính A = 1/3 - 3/4 - -3/5+ 1/73 - 1/26 +1/15 + -2/9
PT
Những câu hỏi liên quan
tính A = 1/3 - 3/4 - -3/5+ 1/73 - 1/26 +1/15 + -2/9
\(A=\frac{1}{3}-\frac{3}{4}-\frac{-3}{5}+\frac{1}{73}-\frac{1}{26}+\frac{1}{15}+\frac{-2}{9}\)
\(\Rightarrow A=\left(\frac{1}{3}-\frac{-3}{5}+\frac{1}{15}\right)-\frac{3}{4}+\frac{1}{73}-\frac{1}{26}+\frac{-2}{9}\)
\(\Rightarrow A=\left(\frac{5}{15}-\frac{-9}{15}+\frac{1}{15}\right)-\frac{39}{52}-\frac{2}{52}+\frac{1}{73}+\frac{-2}{9}\)
\(\Rightarrow A=\left(\frac{5}{15}+\frac{9}{15}+\frac{1}{15}\right)-\left(\frac{39}{52}+\frac{2}{52}\right)+\frac{9}{657}+\frac{-146}{657}\)
\(\Rightarrow A=1-\frac{41}{52}+\frac{-137}{657}=\frac{11}{52}+\frac{-137}{657}=\frac{7227}{34164}+\frac{-7124}{34164}=\frac{103}{34163}\)
Vậy \(A=\frac{103}{34164}\)
Chúc bn học tốt
1> Tính
a) 3/11 + 5/-9 + 4/11 - 4/9 + 3/17 + 15/11
b) M = -3 * 4 - 6 * 8 - 9 * 12 - 12 * 16 - 16 * 20 / -1 * 2 - 2 * 4 - 3 * 6 - 4 * 8 - 6 * 10
c) N = 5/7 - 5/9 - 5/11 / 15/7 + 15/9 + 15/11
d) 4 + 4/73 * 1/23 / 5 + 5/73 * 1/23
nhanh lên nha mk đang cần gấp
thanks nha
a; \(\dfrac{3}{11}\) + \(\dfrac{5}{-9}\) + \(\dfrac{4}{11}\) - \(\dfrac{4}{9}\) + \(\dfrac{3}{17}\) + \(\dfrac{15}{11}\)
= (\(\dfrac{3}{11}\) + \(\dfrac{4}{11}\) + \(\dfrac{15}{11}\)) - (\(\dfrac{5}{9}\) + \(\dfrac{4}{9}\)) + \(\dfrac{3}{17}\)
= 2 - 1 + \(\dfrac{3}{17}\)
= 1 + \(\dfrac{3}{17}\)
= \(\dfrac{20}{17}\)
Đúng 0
Bình luận (0)
c; N = \(\dfrac{\dfrac{5}{7}-\dfrac{5}{9}-\dfrac{5}{11}}{\dfrac{15}{7}+\dfrac{15}{9}+\dfrac{15}{11}}\)
Phải là - \(\dfrac{5}{7}\) chỗ tử số mới đúng em nhé!
Đúng 0
Bình luận (0)
d; \(\dfrac{4+\dfrac{4}{73}\times\dfrac{1}{23}}{5+\dfrac{5}{73}\times\dfrac{1}{23}}\)
= \(\dfrac{4\times\left(1+\dfrac{1}{73\times23}\right)}{5\times\left(1+\dfrac{1}{73\times23}\right)}\)
= \(\dfrac{4}{5}\)
Đúng 0
Bình luận (0)
Tính A= 1/3-3/4-(-3)/5+1/73-1/36+1/15+(-2)/9
Tính A= 1/3-3/4-(-3)/5+1/73-1/36+1/15+(-2)/9
Tính
a)7/4.(4/3-8/5)+|-5/6|:(4/3-5/12)
b)5/7:(9/14-1/7)-3/8.(1/9-5/6)
c)2vaf2/5.(-15/26)+-13/15:|-26/25|
Vaf là và nhé
TÍNH:
\(A=\frac{1}{3}-\frac{3}{4}-\frac{-3}{5}+\frac{1}{73}-\frac{1}{36}+\frac{1}{15}+\frac{-2}{9}\)
AI NHANH MIK TICK CHO
Ta có: \(A=\frac{1}{3}-\frac{3}{4}+\frac{3}{5}+\frac{1}{73}-\frac{1}{36}+\frac{1}{15}-\frac{2}{9}\)
\(A=\left(\frac{1}{3}-\frac{2}{9}\right)+\left(\frac{3}{5}+\frac{1}{15}\right)-\frac{3}{4}-\frac{1}{36}+\frac{1}{73}\)
\(A=\left(\frac{3}{9}-\frac{2}{9}\right)+\left(\frac{9}{15}+\frac{1}{15}\right)-\left(\frac{3}{4}+\frac{1}{36}\right)+\frac{1}{73}\)
\(A=\frac{1}{9}+\frac{10}{15}-\frac{7}{9}+\frac{1}{73}\)
\(A=\frac{1}{9}+\frac{2}{3}-\frac{7}{9}+\frac{1}{73}\)
\(A=\frac{1}{9}+\frac{6}{9}-\frac{7}{9}+\frac{1}{73}\)
\(A=\frac{7}{9}-\frac{7}{9}+\frac{1}{73}\)
\(A=\frac{1}{73}\)
Vậy: \(A=\frac{1}{73}\)
Đúng 0
Bình luận (0)
thực hiện phép tính
A= 26/11x 7/4 x 22/21 x 9
B= -10/21 x [ 9/15 + (3/5)2 ]
C= ( 2 - 1/2 - 1/3) x ( 1- 1/4 - 1/7)
Tính :
2/5 + 11/15 =
7/8 - 7/9 =
11/13 x 26/31 =
16/24 : 4 =
30 : 6/5 =
9/16 : 4 =
1/2 : 1/3 x 8/15 =
\(\dfrac{2}{5}+\dfrac{11}{15}=\dfrac{6}{15}+\dfrac{11}{15}=\dfrac{17}{15}\)
\(\dfrac{7}{8}-\dfrac{7}{9}=\dfrac{63}{72}-\dfrac{56}{72}=\dfrac{7}{72}\)
\(\dfrac{11}{13}\times\dfrac{26}{31}=\dfrac{22}{31}\)
\(\dfrac{16}{24}:4=\dfrac{16}{24}\times\dfrac{1}{4}=\dfrac{4}{24}=\dfrac{1}{6}\)
\(30:\dfrac{6}{5}=30\times\dfrac{5}{6}=25\)
\(\dfrac{9}{16}:4=\dfrac{9}{16}\times\dfrac{1}{4}=\dfrac{9}{64}\)
\(\dfrac{1}{2}:\dfrac{1}{3}\times\dfrac{8}{15}=\dfrac{1}{2}\times3\times\dfrac{8}{15}=\dfrac{4}{5}\)
Đúng 1
Bình luận (0)
2/5 + 11/15 = 17/15
7/8 - 7/9 = 7/72
11/13 x 26/31 = 22/31
16/24 : 4 = 1/6
30 : 6/5 = 25
9/16 : 4 = 9/64
1/2 : 1/3 x 8/15 = 3/2 x 8/15 = 4/5
Đúng 1
Bình luận (0)
Bài 442: Tính hợp lý:
1. 1/3 . 4/5 + 1/3 . 6/5 - 1/3
2. 3/7 . 9/26 - 1/14 . 1/13
3. 15(1/5 - 7/15 + 17/3)
4. 38(2và1/19 - 5và7/38)
5. 75( - 4/25 + 7và1/15 - 5và7/75)
\(1)\frac{1}{3}.\frac{4}{5}+\frac{1}{3}.\frac{6}{5}-\frac{1}{3}\)
\(=\frac{1}{3}\left(\frac{4}{5}+\frac{6}{5}\right)\)
\(=\frac{1}{3}.2\)
\(=\frac{2}{3}\)
\(1)\)\(\frac{1}{3}.\frac{4}{5}+\frac{1}{3}.\frac{6}{5}-\frac{1}{3}\)
\(=\frac{1}{3}.\left(\frac{4}{5}+\frac{6}{5}-1\right)\)
\(=\frac{1}{3}.\left(\frac{4}{5}+\frac{6}{5}-\frac{5}{5}\right)\)
\(=\frac{1}{3}.1\)
\(=\frac{1}{3}\)
\(2)\)\(\frac{3}{7}.\frac{9}{26}-\frac{1}{14}.\frac{1}{13}\)
\(=\frac{1}{7}.\frac{27}{26}-\frac{1}{7}.\frac{1}{26}\)
\(=\left(\frac{27}{26}-\frac{1}{26}\right).\frac{1}{7}\)
\(=1.\frac{1}{7}\)
\(=\frac{1}{7}\)
\(3)\)\(15\left(\frac{1}{5}-\frac{7}{15}+\frac{17}{3}\right)\)
\(=3-7+85\)
\(=81\)
\(4)\)\(38\left(2\frac{1}{19}-5\frac{7}{38}\right)\)
\(=38\left(\frac{39}{19}-\frac{197}{38}\right)\)
\(=78-197\)
\(=-119\)
\(5)\)\(75\left(\frac{-4}{25}+7\frac{1}{15}-5\frac{7}{75}\right)\)
\(=75\left(\frac{-4}{25}+\frac{106}{15}-\frac{382}{75}\right)\)
\(=-12+530-382\)
\(=136\)
Ddaeng
1, \(\frac{1}{3}.\frac{4}{5}+\frac{1}{3}.\frac{6}{5}-\frac{1}{3}\)
\(=\frac{1}{3}.\left(\frac{4}{5}+\frac{6}{5}\right)-\frac{1}{3}\)
\(=\frac{1}{3}.2-\frac{1}{3}\)
\(=\frac{2}{3}-\frac{1}{3}\)
\(=\frac{1}{3}\)
2, \(\frac{3}{7}.\frac{9}{26}-\frac{1}{14}.\frac{1}{13}\)
\(=\frac{1}{7}.3.\frac{9}{26}-\frac{1}{7}.\frac{1}{2}.\frac{1}{13}\)
\(=\frac{1}{7}.\frac{27}{26}-\frac{1}{7}.\frac{1}{26}\)
\(=\frac{1}{7}.\left(\frac{27}{26}-\frac{1}{26}\right)\)
\(=\frac{1}{7}.1\)
\(=\frac{1}{7}\)
3, \(15.\left(\frac{1}{5}-\frac{7}{15}+\frac{17}{3}\right)\)
\(=15.\frac{1}{5}-15.\frac{7}{15}+15.\frac{17}{3}\)
\(=3-7+85\)
\(=81\)
4, \(38.\left(2\frac{1}{19}+5\frac{7}{38}\right)\)
\(=38.\left(\frac{39}{19}+\frac{197}{38}\right)\)
\(=38.\frac{39}{19}+38.\frac{197}{38}\)
\(=78+197\)
\(=275\)
5, \(75.\left(\frac{-4}{25}+7\frac{1}{15}-5\frac{7}{75}\right)\)
\(=75.\left(\frac{-4}{25}+\frac{106}{15}-\frac{382}{75}\right)\)
\(=75.\frac{-4}{25}+75.\frac{106}{15}-75.\frac{382}{75}\)
\(=-12+530-382\)
\(=136\)