1) Efetue as operações algébricas.
a) -y b² + y b² - 7 y b² + 15 y b² =
b) 0,5x + 1,4x+2,8x-2x+ =
c) x² y³/4 - 2x ²y³/3 + x ² y ³=
d) √2 a³/2 - √2 a³/2=
alguem me ajudar por favor.... alguemm agradeço muitoo
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