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a)|0|+|45|+(-|-455)|+|796|
= 0+45+(-455)+796
=45-455+796
=-410+796
=386
b)-|-33|+(-12)+18+|45-40|-57
=-33-12+18+|5|-57
=-45+18-5-57
=-33-5-57
=-38-57
=-95
c)|40-37|-|13-52|
=|13|-|-39|
=13-39
=-38
|0| + |45| + (-|-455)| + |-796|
= 0 + 45 - 455 + 796
= 386
-|-33 | + (-12) + 18 + |45 - 40| - 57
= -33 - 12 + 18 + 5 - 57
= -79
|40 - 37| - |13 - 52|
= |3| - |-39|
= 3 - 39
= -36
1.\(\left(x-40\right)\left(x-7\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-40=0\\x-7=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=40\\x=7\end{cases}}\)
2. \(\left(x-12\right)\left(x+13\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-12=0\\x+13=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=12\\x=-13\end{cases}}\)
3. \(\left(2-x-4\right)\left(3x-9\right)=0\)
\(\Rightarrow\orbr{\begin{cases}2-x-4=0\\3x-9=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=-2\\x=3\end{cases}}\)
\(a,\dfrac{-5}{13}+\dfrac{8}{13}=\dfrac{3}{13}\\ b,\dfrac{5}{31}+\dfrac{-22}{31}=\dfrac{-17}{31}\\ c,\dfrac{-13}{43}+\dfrac{-40}{43}=\dfrac{-53}{43}\\ d,\dfrac{-3}{29}-\dfrac{16}{58}=\dfrac{-11}{29}\\ e,\dfrac{8}{40}-\dfrac{-36}{45}=1\\ f,\dfrac{-8}{18}-\dfrac{-15}{27}=\dfrac{1}{9}\\ g,\left(-2\right)+\dfrac{-5}{8}=\dfrac{-21}{8}\)
Ta có: \(B=\dfrac{11}{13}\cdot\dfrac{40}{13}+\dfrac{37}{5}:\dfrac{7}{33}-\left(\dfrac{11}{13}+\dfrac{33}{7}:\dfrac{5}{2}\right)\)
\(=\dfrac{440}{169}+\dfrac{37}{5}\cdot\dfrac{33}{7}-\dfrac{11}{13}-\dfrac{33}{7}\cdot\dfrac{2}{5}\)
\(=\dfrac{297}{169}+\dfrac{33}{7}\cdot\left(\dfrac{37}{5}-\dfrac{2}{5}\right)\)
\(=\dfrac{297}{169}+\dfrac{33}{7}\cdot7\)
\(=\dfrac{297}{169}+33=\dfrac{5874}{169}\)
3*13-13*18=3*(3-18)=3*(-15)
15*40-80=15*(40-20)=15*20
\((-5)^3*10*4^3=(-5)^3*4^3*40 =(-20)^40 135*(-2)^14*(-100)= tự làm nhé k mk nha \)
Trả lời:
(- 40) . 0 + (- 13) + 40 + (- 13)
= [(- 40) + 40] + [(- 13) + (- 13)] . 0
= 0 + 0 . 0
= 0 + 0
= 0