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a) \(A=\left\{1;2;3;4;5\right\}\)
\(\Rightarrow A=\left\{x\inℕ|1\le x\le5\right\}\)
b) \(B=\left\{0;1;2;3;4\right\}\)
\(\Rightarrow B=\left\{x\inℕ|0\le x\le4\right\}\)
c) \(C=\left\{1;2;3;4\right\}\)
\(\Rightarrow C=\left\{x\inℕ|1\le x\le4\right\}\)
d) \(D=\left\{0;2;4;6;8\right\}\)
\(\Rightarrow D=\left\{x\inℕ|x=2k;0\le k\le4;k\inℕ\right\}\)
e) \(E=\left\{1;3;5;7;9;...49\right\}\)
\(\Rightarrow E=\left\{x\inℕ|x=2k+1;0\le k\le24;k\inℕ\right\}\)
f) \(F=\left\{11;22;33;44;...99\right\}\)
\(\Rightarrow F=\left\{x\inℕ|x=11k;1\le k\le9;k\inℕ\right\}\)
a: -3/4x12=-36/4=-9
b: \(=\dfrac{7}{15}\cdot\dfrac{10}{21}=\dfrac{7}{21}\cdot\dfrac{10}{15}=\dfrac{1}{3}\cdot\dfrac{2}{3}=\dfrac{2}{9}\)
c: \(=\dfrac{7}{18}\cdot\dfrac{12}{21}=\dfrac{12}{18}\cdot\dfrac{7}{21}=\dfrac{2}{3}\cdot\dfrac{1}{3}=\dfrac{2}{9}\)
d: \(=\dfrac{11}{15}\cdot\dfrac{5}{22}=\dfrac{11}{22}\cdot\dfrac{5}{15}=\dfrac{1}{2}\cdot\dfrac{1}{3}=\dfrac{1}{6}\)
e: \(=-\dfrac{8}{15}\cdot\dfrac{5}{4}=\dfrac{-40}{60}=\dfrac{-2}{3}\)
f: \(=-15\cdot\dfrac{3}{5}=-9\)
a.\(y=f\left(1\right)=\left(-2\right).1=-2\\ y=f\left(0,5\right)=\left(-2\right).0,5=-1\)
b.vẽ thì tự vẽ ik