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\(\dfrac{7}{15}.\dfrac{4}{5}+\dfrac{7}{15}.\dfrac{1}{5}-\dfrac{7}{15}\)
\(=\dfrac{7}{15}.\left(\dfrac{4}{5}+\dfrac{1}{5}-1\right)\)
\(=\dfrac{7}{15}.0\)
\(=0\)
\(\dfrac{7}{15}\cdot\dfrac{4}{5}+\dfrac{7}{15}\cdot\dfrac{1}{5}-\dfrac{7}{15}\)
\(=\dfrac{7}{15}\cdot\left(\dfrac{4}{5}+\dfrac{1}{5}-1\right)\)
\(=\dfrac{7}{15}\cdot\left(1-1\right)\)
\(=\dfrac{7}{15}\cdot0\)
\(=0\)
Thực hiện phép tính
-a) -5/7.7/10-3/11:6/5
b) 5/14.1/3.-4/15:5/7
c) 2 13/15.11/15-13/15+2 13/15 . 4/15
a) -5/7.7/10 - 3/11 : 6/5
= -1/2 - 5/22
= -8/11
b) 5/14.1/3.-4/15:5/7
= -2/63:5/7 = -2/45
c) 2 13/15.11/15 - 13/15 + 2 13/15.4/15
= 2 13/15.(11/15 + 4/15) - 13/15
= 2 13/15.1 - 13/15
= 2 13/15 - 13/15
= 2
\(1+\left(-5\right)+15=11\)
\(1+\left[\left(-5\right)+15\right]=11\)
\(1-\left(5-15\right)=11\)
\(\dfrac{5}{13}.\dfrac{8}{15}+\dfrac{5}{13}.\dfrac{26}{15}-\dfrac{5}{13}.\dfrac{8}{15}.\\ =\dfrac{5}{13}.\left(\dfrac{8}{15}+\dfrac{26}{15}-\dfrac{8}{15}\right).\\ =\dfrac{5}{13}.\dfrac{26}{15}=\dfrac{2}{3}.\)
dễ mà nhóc :
\(5^{20}:\left(5^{15}.6+5^{15}.19\right)=5^{20}:\left[5^{15}\left(6+19\right)\right]=5^{20}:\left(5^{25}.15\right)=5^{20}:5^{25}.15=.......\)
tự lm tiếp nhé nhóc tỉ còn dj thì violymic nua
= -10
TL
TL--------------------
(-15)-(-5)
=(-15)+5
=-10
hok tốt