原式=(1.22*3)^2-(1.33*2)^2=3.66^2-2.66^2=(3.66+2.66)(3.66-2.66)=6.32
原式=(a^2+2+1/a^2)(a^2-2+1/a^2)=(a+1/a)^2(a-1/a)^2=[(a+1/a)(a-1/a)]^2=(a^2-1/a^2)^2=a^4-2+1/a^4
原式=2.5*10^4*5*10^5=(2.5*5)(10^4*10^5)=12.5*10^9=1.25*10^10
原式=(1.22*3)^2-(1.33*2)^2=3.66^2-2.66^2=(3.66+2.66)(3.66-2.66)=6.32
原式=(a^2+2+1/a^2)(a^2-2+1/a^2)=(a+1/a)^2(a-1/a)^2=[(a+1/a)(a-1/a)]^2=(a^2-1/a^2)^2=a^4-2+1/a^4
原式=2.5*10^4*5*10^5=(2.5*5)(10^4*10^5)=12.5*10^9=1.25*10^10