Հանրահաշիվ

ա)(10+3)(10-3)

բ)(-2-2)(-2+3)-(5+2)

գ)5(a²-2ab+b²)=5(a-b)²=5(124-24)²

դ)a(x²+2xy+y²)=a(x+y)²=4(71+29)²=4•10000=40000

ա)3600-100=3500

բ)10000-6400=3600

գ)14400-6400=8000

դ)3969-289=3680