1.Zredukuj wyrazy podobne i wykonaj działania
a).(10a+3b)(7a-4b)
b).3(x-5y)(2x+y)
c).(a-5b)(2a+b)(2a-3b)
d).(0,5x+0,1y)^2
e).(x^2+1)(x^2-1)
f).(x^2-1)^2
^------> do kwadratu
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a)70a^2-40ab+21ab-12b^2=70a^2-19ab-12b^2
b)3*2x^2+xy-10xy-5y^2=6x^2-9xy-5y^2
c)4a^3-3ab^2-20a^2b+15b^3
d)0,25x^2+0,1xy+0,01y^2
e)x^4-x^2+x^2-1=x^4-1
f)x^4-x^2-x^2+1=x^4-2x^2+1