Explicación paso a paso:
18. (6ab+10)(7a-2b)= 42a²b - 12ab² + 70a - 20b
19. (-12mn+5)(-3mn-2)= 36m²n² + 24mn - 15mn - 10
=36m²n² + 9mn - 10
20. (3a-5b+3c)(4a+2b+c)= 12a² + 6ab + 3ac - 20ab - 10b² -5bc + 12ac + 6bc + 3c²
= 12a² - 14ab + 15ac - 10b² - bc + 3c²
21. (5x+8y+12)(-3-4y+9)= -15x - 20xy + 45x - 24y - 32y² + 72y -36 - 48y + 108
= 30x - 20xy - 32y² + 72
22. (-3x²y-2xy²-xy)(x²-y²)= -3x⁴y + 3x²y³ -2x³y² + 2xy⁴- x³y +xy³
Espero te sirva :).
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Explicación paso a paso:
18. (6ab+10)(7a-2b)= 42a²b - 12ab² + 70a - 20b
19. (-12mn+5)(-3mn-2)= 36m²n² + 24mn - 15mn - 10
=36m²n² + 9mn - 10
20. (3a-5b+3c)(4a+2b+c)= 12a² + 6ab + 3ac - 20ab - 10b² -5bc + 12ac + 6bc + 3c²
= 12a² - 14ab + 15ac - 10b² - bc + 3c²
21. (5x+8y+12)(-3-4y+9)= -15x - 20xy + 45x - 24y - 32y² + 72y -36 - 48y + 108
= 30x - 20xy - 32y² + 72
22. (-3x²y-2xy²-xy)(x²-y²)= -3x⁴y + 3x²y³ -2x³y² + 2xy⁴- x³y +xy³
Espero te sirva :).