calcule as expressões algébricas encontrando seu valor numérico
a) 5a+3b-2c
a= -2
b= -1
c= -3



b)
[tex]2 \times^{2} + 3 {y}^{3} [/tex]
x= 2
y= -1



c)
[tex] \frac{2b + c}{a + c} [/tex]
a= 2
b= 4
c= 6
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