Efetua as operações
Monómios e polinómios: Matematicamente Falando 8 - Pág. 146 Ex. 4
Enunciado
Efetua as operações seguintes, escritas nos cartões.
Resolução
| A | \[2x + 3x = \left( {2 + 3} \right)x = 5x\] |
| B | \[2x \times 3x = \left( {2 \times 3} \right) \times \left( {x \times x} \right) = 6{x^2}\] |
| C | \[ – \frac{1}{3}{a^2} \times \frac{2}{5}{a^2} = \left( { – \frac{1}{3} \times \frac{2}{5}} \right) \times \left( {{a^2} \times {a^2}} \right) = – \frac{2}{{15}}{a^4}\] |
| D | \[ – \frac{2}{3}y – \frac{5}{3}y = \left( { – \frac{2}{3} – \frac{5}{3}} \right)y = – \frac{7}{3}y\] |
| E | \[ – \frac{2}{3}y \times \left( { – \frac{5}{3}y} \right) = \left( { – \frac{2}{3} \times \left( { – \frac{5}{3}y} \right)} \right) \times \left( {y \times y} \right) = \frac{{10}}{9}{y^2}\] |
| F | \[ – \frac{1}{3}{a^2} + \frac{2}{5}{a^2} = \left( { – \frac{1}{{\mathop 3\limits_{\left( 5 \right)} }} + \frac{2}{{\mathop 5\limits_{\left( 3 \right)} }}} \right) \times {a^2} = \frac{1}{{15}}{a^2}\] |
