Question

efetue:
a)27ax - 35ax
b)
$\frac{4}{9} {x}^{2}y - \frac{5}{6} {x}^{2}y$
c)(-7x). (-2x)
d)(+15). (5xy)

Answer 1

a)27ax -35ax = -8ax

b)
$\frac{4}{9} {x}^{2} y - \frac{5}{6} {x}^{2} y = \\ \frac{4}{9} - \frac{5}{6} = \frac{6 - 15}{18} = \frac{ - 9}{18} \frac{ \div 9}{ \div 9} \\ - \frac{1}{2} {x}^{2} y$

c)(-7x)•(-2x)=14x²

d)(15x)•(5xy)= 74x²y

e)
$( \frac{ - mn}{2} ) \times ( \frac{ {m}^{2} {n}^{3} }{7} ) = \frac{ - {m}^{3} {n}^{4} }{14}$

f)(20a⁴b²):(5ab)=4a³b

g)(-2a⁴xy):(3ax)=
$- \frac{ 2}{3} {a}^{3} y$