-0.6*(-9)^4+1.9*(-9)^2-4=?

(16*10^-2)^2*(13*10^4)=?

(4.9*10^-3)*(4*10^-2)=?

-0.9*6561+1.9*81-4=-5755(16*0.01)^2*(13*10000)=0.16^2*130000=0.0256*130000=3328(4.9*0.001)*(4*0.01)=0.0049*0.04=0.000196