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a: \(=\dfrac{15}{4}:\dfrac{2-7}{16}-\dfrac{5}{9}\cdot\left(\dfrac{3}{5}+\dfrac{4}{5}\right)\)
\(=\dfrac{15}{4}\cdot\dfrac{16}{-5}-\dfrac{5}{9}\cdot\dfrac{7}{5}\)
\(=\dfrac{-240}{20}-\dfrac{7}{9}=-12-\dfrac{7}{9}=\dfrac{-115}{9}\)
c: \(=\dfrac{1}{5}-\dfrac{7}{2}-\dfrac{3}{2}+\dfrac{5}{4}\)
\(=\dfrac{4+25}{20}-5=\dfrac{29}{20}-\dfrac{100}{20}=\dfrac{-71}{20}\)
d: \(=\dfrac{12}{17}\left(1-\dfrac{1}{15}-\dfrac{4}{5}+1\right)=\dfrac{12}{17}\cdot\dfrac{17}{15}=\dfrac{12}{15}=\dfrac{4}{5}\)
e: \(=\dfrac{2}{15}\cdot\dfrac{9}{8}-\dfrac{7}{4}\cdot\dfrac{9}{8}+\dfrac{25}{36}\)
\(=\dfrac{9}{8}\left(\dfrac{2}{15}-\dfrac{7}{4}\right)+\dfrac{25}{36}\)
\(=\dfrac{9}{8}\cdot\dfrac{8-105}{60}+\dfrac{25}{36}\)
\(=\dfrac{9}{8}\cdot\dfrac{-97}{60}+\dfrac{25}{36}=\dfrac{-1619}{1440}\)
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 + \(\dfrac{3}{17}\)
= \(\dfrac{20}{17}\)
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!
a)=(-14).(-5)
=70
b)=(32-2):(-5)
=30:(-5)
=-6
c)=-72-12
=-84
d)=-35+(-4)-39
=-39-39
=-78
e)=78:(-30+36)
=78:6
=13
f)=-3.(-3)-12
=9-12
=-3
g)=45-5-2+12
=40-2+12
=38+12
=50
mình giải luôn chứ mik hông chép đề đâu nha^^
a) (-6 - 8) . (-9 + 4)
= (-14) . (-5)
= 70.
b) (8. 4 - 2) : (-5)
= (32 - 2) : (-5)
= 30 : (-5)
= -6.
c) -8. 9 - (-9 + 21)
= -8. 9 - 12
= -72 - 12
= -84.
d) -5. 7 + (-32) : 8 - (-15 + 54)
= -5. 7 + (-32) : 8 - 39
= -35 + (-32) : 8 - 39
= -35 + (-4) - 39
= -39 - 39
= -78.
e) 78 : (-6. 5 + 36)
= 78 : (-30 + 36)
= 78 : 6
= 13.
f) 15 : (-5). (-3) - 12
= -3. (-3) - 12
= 9 - 12
= -3.
g) 45 - 15 : +3 - 18 : 6 + 12
= 45 - 5 - 18 : 6 + 12
= 45 - 5 - 3 + 12
= 40 - 3 + 12
= 37 + 12
= 49.
1) (-5) . (-8) - 45 . (-3) +(-6) . (-12)= 247
b) 6 . (-15) + (-8) . (-9) - 72 . (-2)= 126
c) (-15) . 4 - (-4) .16 - (-8) . 32 = 260
nhanh nhé