Question

вычислите (17,31^2-12,69^2)-(29,81^2-0,19^2)

Answer 1

$(17.31 ^{2} -12.69 ^{2} )-(29.81 ^{2} -0.19 ^{2} )=(17.31-12.69)(17.31+12.69)-\-(29.81-0.19)(29.81+0.19)=4.62*30-29.62*30= \ =30*(4.60-29.62)=30*(-25.02)=-750.6$