Oblicz:
a) -3xy²y·(-2)xy=
b)5ab√2·(-3)a²·√3=
c)4a-(5a-7)-(3a+12)=
d)2x(3x-4y+6)-5(2x-3xy+4x)=
e)(5a-7b)(4a²-9b)=
a) -3xy²y·(-2)xy= -3xy³ * -2xy= 6x²y⁴
b)5ab√2·(-3)a²·√3= 5ab√2 * -3a²√3 = 15a³b *6= 90a²b
c)4a-(5a-7)-(3a+12)=4a-5a+7-3a+12= -4a+19
d)2x(3x-4y+6)-5(2x-3xy+4x)= 6x²-8xy+12x-10x+15xy+20x= 6x²+7xy+22x
e)(5a-7b)(4a²-9b)= 20a³-45ab-28a²b-63b²
=6x²y⁴
=-15a³b√6
=4a-5a+7-3a-12=
=-4a-5
=6x²-8xy+12x-10x+15xy-20x=
=6x²+7xy-18x
=20a³-45ab-28a²b+63b²
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a) -3xy²y·(-2)xy= -3xy³ * -2xy= 6x²y⁴
b)5ab√2·(-3)a²·√3= 5ab√2 * -3a²√3 = 15a³b *6= 90a²b
c)4a-(5a-7)-(3a+12)=4a-5a+7-3a+12= -4a+19
d)2x(3x-4y+6)-5(2x-3xy+4x)= 6x²-8xy+12x-10x+15xy+20x= 6x²+7xy+22x
e)(5a-7b)(4a²-9b)= 20a³-45ab-28a²b-63b²
a) -3xy²y·(-2)xy=
=6x²y⁴
b)5ab√2·(-3)a²·√3=
=-15a³b√6
c)4a-(5a-7)-(3a+12)=
=4a-5a+7-3a-12=
=-4a-5
d)2x(3x-4y+6)-5(2x-3xy+4x)=
=6x²-8xy+12x-10x+15xy-20x=
=6x²+7xy-18x
e)(5a-7b)(4a²-9b)=
=20a³-45ab-28a²b+63b²