Cześć!
Szczegółowe wyjaśnienie:
a)
[tex]3a + 2a\cdot5a - 7a {}^{2} + \frac{6a {}^{2} }{3} = 3a + 10a {}^{2} - 7a {}^{2} + 2a {}^{2} = 3a + 5a {}^{2} [/tex]
b)
[tex]3x {}^{2} + 2x\cdot( - 3x) + 4x {}^{2} + \frac{15x}{ 3} = 3x {}^{2} - 6x {}^{2} + 4x {}^{2} + 5x = x {}^{2} + 5x[/tex]
c)
[tex] - 4y\cdot5x + 2y\cdot5 - 3x\cdot2y + \frac{8xy}{2} = - 20xy + 10x - 6xy + 4xy = - 22xy + 10x[/tex]
d)
[tex] \frac{10ab}{5} + 5b {}^{2} - 2b\cdot5b - 3b {}^{2} \cdot2\cdot2ab = 2ab + 5b {}^{2} - 10b {}^{2} - 12ab {}^{3} = 2ab - 5b {}^{2} - 12ab {}^{3} [/tex]
