Thực hiện phép tính sau :
\(\dfrac{\dfrac{15}{6x16}+\dfrac{15}{16x26}+\dfrac{15}{26x36}}{\dfrac{33}{6x16}-\dfrac{63}{16x26}\dfrac{93}{26x36}}\)
Thực hiện phép tính sau:
\(\frac{\frac{15}{6x16}+\frac{15}{16x26}+\frac{15}{26x36}}{\frac{33}{6x16}-\frac{63}{16x26}+\frac{93}{26x36}}\)
15/6x16+15/16x26+15/26x36 : 33/6x16-63/16x26+93/26x36
\(\frac{15}{6.16}+\frac{15}{16.26}+\frac{15}{26.36}:\frac{33}{6.16}-\frac{63}{16.26}+\frac{93}{26.36}\)
\(=\left(\frac{15}{6.16}:\frac{33}{6.16}\right)+\left(\frac{15}{16.26}-\frac{63}{16.26}\right)+\left(\frac{15}{26.36}+\frac{93}{26.36}\right)\)
\(=\frac{5}{11}+\frac{\left(-3\right)}{26}+\frac{3}{26}\\ =\frac{5}{11}+\left(\frac{\left(-3\right)}{26}+\frac{3}{26}\right)\\=\frac{5}{11}+0=\frac{5}{11} \)
A = \(\dfrac{\dfrac{15}{6.16}+\dfrac{15}{16.26}+\dfrac{15}{26.36}}{\dfrac{33}{6.16}-\dfrac{63}{16.26}+\dfrac{93}{26.36}}\)
\(A=\dfrac{15}{6.16}+\dfrac{15}{16.26}+\dfrac{15}{26.36}\)
____________________
\(\dfrac{33}{6.16}-\dfrac{63}{16.26}+\dfrac{93}{26.36}\)
Tính nhanh
sorry mk trả lời lại nè\(\dfrac{15\cdot\left(\dfrac{1}{6\cdot16}+\dfrac{1}{16\cdot26}+\dfrac{1}{26\cdot36}\right)}{33\cdot\left(\dfrac{1}{6\cdot16}+\dfrac{1}{16\cdot26}+\dfrac{1}{26\cdot36}\right)}=\dfrac{15}{33}\)
Thực hiện phép tính (tính nhanh nếu có thể)
\(\dfrac{11}{15}.\dfrac{4}{11}+\dfrac{11}{15}.\dfrac{5}{11}+\dfrac{11}{15}.\dfrac{2}{11}\)
= \(\dfrac{11}{15}\). \(\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)\)
= \(\dfrac{11}{15}\). 1
=\(\dfrac{11}{15}\)
\(=\dfrac{11}{15}\cdot\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)=\dfrac{11}{15}\cdot\dfrac{11}{11}=\dfrac{11}{15}\)
11/15 . ( 4/11 +5/11 + 2/11 )
= 11/15 . 1
= 11/15
Thực hiện phép tính sau:
2) \(B=\dfrac{13}{15}.0,15.3+\left(\dfrac{8}{15}-1\dfrac{19}{60}\right):1\dfrac{23}{24}\)
\(B=\dfrac{13}{15}\cdot0,15\cdot3+\left(\dfrac{8}{15}-1\dfrac{19}{60}\right):\left(1\dfrac{23}{24}\right)\)
\(=\dfrac{13}{15}\cdot\dfrac{15}{100}\cdot3+\left(\dfrac{32}{60}-1-\dfrac{19}{60}\right):\dfrac{47}{24}\)
\(=\dfrac{39}{100}+\dfrac{-47}{60}\cdot\dfrac{24}{47}\)
\(=\dfrac{39}{100}-\dfrac{24}{60}=\dfrac{39}{100}-\dfrac{40}{100}=-\dfrac{1}{100}\)
Bài 1: Thực hiện phép tính sau:
\(c,\dfrac{12}{5}:\dfrac{16}{15}\)
\(d,\dfrac{9}{8}:\dfrac{6}{5}\)
12/5 : 16/15 = 9/4
9/8 : 6/5 = 15/16
Chúc bạn học tốt!! ^^
c, \(\dfrac{12}{5}:\dfrac{16}{15}=\dfrac{12}{5}.\dfrac{15}{16}=\dfrac{9}{4}\)
d, \(\dfrac{9}{8}:\dfrac{6}{5}=\dfrac{9}{8}.\dfrac{5}{6}=\dfrac{15}{16}\)
c. 12/5 : 16/15
= 12/5 . 15/16
= 9/4
d. 9/8 : 6/5
= 9/8 . 5/6
= 15/16
Bài 1: Thực hiện phép tính một cách hợp lí:
f) \(\dfrac{-5}{9}\) + \(\dfrac{8}{15}\) + \(\dfrac{-2}{11}\) + \(\dfrac{4}{-9}\) +\(\dfrac{7}{15}\)
=-5/9-4/9+8/15+7/15-2/11
=-1+1-2/11
=-2/11
` -5/9 + 8/15 + (-2)/11 + 4/(-9) + 7/15 `
`= ( (-5)/9 + (-4)/9 ) + ( 8/15 + 7/15 ) + (-2)/11`
`= -9/9 + 15/15 + (-2)/11`
`= -1 + 1 + (-2)/11`
`= 0 + (-2)/11`
`= -2/11`
Thực hiện phép tính ( tính nhanh nếu có thể ) :
a) \(\dfrac{3}{5}+\dfrac{1}{5}.\dfrac{-17}{9}\)
b) \(\left(-\dfrac{4}{15}-\dfrac{18}{19}\right)-\left(\dfrac{20}{19}+\dfrac{11}{15}\right)\)
\(a,\dfrac{3}{5}+\dfrac{1}{5}.\dfrac{-17}{9}=\dfrac{3}{5}-\dfrac{17}{45}=\dfrac{27}{45}-\dfrac{17}{45}=\dfrac{10}{45}=\dfrac{2}{9}\\ b,\left(-\dfrac{4}{15}-\dfrac{18}{19}\right)-\left(\dfrac{20}{19}+\dfrac{11}{15}\right)=-\dfrac{4}{15}-\dfrac{18}{19}-\dfrac{20}{19}-\dfrac{11}{15}=\left(-\dfrac{4}{15}-\dfrac{11}{15}\right)-\left(\dfrac{18}{19}+\dfrac{20}{19}\right)=-1-2=-3\)
\(a,=\dfrac{3}{5}+\left(-\dfrac{17}{45}\right)=\dfrac{2}{9}\)
\(b,=-\dfrac{4}{15}-\dfrac{18}{19}-\dfrac{20}{19}-\dfrac{11}{15}=-3\)
a. 3/5+1/5.-17/9
=3/5+-17/45
=27/45+-17/45
=2/9
b. (-4/15-18/19)-(20/19+11/15)
=-4/15-18/19-20/19-11/15
=(-4/15-11/15)-(18/19-20/19)
=(-1)-(-2/19)
=(-19/19)-(-2/19)
=-17/19