Cześć!
Szczegółowe wyjaśnienie:
a)
[tex] - 3ac \cdot5c = - 15ac {}^{1} \cdot \: c {}^{1} = - 15ac {}^{1 + 1} = - 15ac {}^{2} [/tex]
b)
[tex]4 \cdot2b = 8b[/tex]
c)
[tex] - 5ab \cdot3a \cdot2b = - 30a {}^{1} b{}^{1}a {}^{1} b {}^{2} = - 30a {}^{1 + 1}b {}^{1 + 2 } = - 30a {}^{2} b {}^{3} [/tex]
d)
[tex] - 4a {}^{2} \cdot8ab = - 32a {}^{2} \cdot \: a {}^{1} b = - 32a {}^{2 + 1} b = - 32a {}^{3} b[/tex]
e)
[tex] - 7a {}^{2} b \cdot( - b {}^{2} a) = - 7a {}^{2} b \cdot( - ab {}^{2} ) = 7a {}^{3} b {}^{3} [/tex]
f)
[tex] - 7ab \cdot( - 2a) = 14a {}^{2} b[/tex]
g)
[tex] - 2a \cdot( - 4a) = 8a {}^{2} [/tex]
h)
[tex]3a \cdot7b = 21ab[/tex]
