Cho hàm số \(y = f\left( x \right) = {3 \over 4}x\). Tính
\(f\left( { - 5} \right)\); \(f\left( { - 4} \right)\); \(f\left( { - 1} \right)\); \(f\left( 0 \right)\); \(f\left( {{1 \over 2}} \right)\);
\(f\left( 1 \right)\); \(f\left( 2 \right)\); \(f\left( 4 \right)\); \(f\left( a \right)\); \(f\left( {a + 1} \right)\).
\(f\left( { - 5} \right) = {3 \over 4}.\left( { - 5} \right) = - {{15} \over 4}\)
\(f\left( { - 4} \right) = {3 \over 4}.\left( { - 4} \right) = - 3\)
\(f\left( { - 1} \right) = {3 \over 4}.\left( { - 1} \right) = - {3 \over 4}\)
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\(f\left( 0 \right) = {3 \over 4}.0 = 0\)
\(f\left( {{1 \over 2}} \right) = {3 \over 4}.{1 \over 2} = {3 \over 8}\)
\(f\left( 1 \right) = {3 \over 4}.1 = {3 \over 4}\)
\(f\left( 2 \right) = {3 \over 4}.2 = {6 \over 4} = {3 \over 2}\)
\(f\left( 4 \right) = {3 \over 4}.4 = 3\)
\(f\left( a \right) = {3 \over 4}a\)
\(f\left( {a + 1} \right) = {3 \over 4}.\left( {a + 1} \right) = {{3a + 3} \over 4}\)