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Iura1234567890
a fost răspuns

Calculati formind formulele de calcul prescurtat:
a)(5x²+7y)(5x²-7y)
b)1005²
c)6x(7x-9y)
d)√3a²+√19b)²

Răspuns :

Renatemambouko
a)(5x²+7y)(5x²-7y)=
=25x²-49y²
b)1005² =(1000+5)²=1000000+10000+25=1010025
c)6x(7x-9y)=42x²-54xy
d)√3a²+√19b)² =3a⁴+2√68a²b+19b²=3a⁴+4√17a²b+19b²














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