(1)当a=﹣2,b=1时,(a+b) 2=1,a 2+2ab+b 2=1;
(2)当a=﹣2,b=﹣3时,(a+b) 2=25,a 2+2ab+b 2=25;
(3)(a+b) 2=a 2+2ab+b 2;
(4)原式=1965 2+2×1965×35+35 2
=(1965+35) 2
=4000000.
(1)当a=﹣2,b=1时,(a+b) 2=1,a 2+2ab+b 2=1;
(2)当a=﹣2,b=﹣3时,(a+b) 2=25,a 2+2ab+b 2=25;
(3)(a+b) 2=a 2+2ab+b 2;
(4)原式=1965 2+2×1965×35+35 2
=(1965+35) 2
=4000000.