Question

Вычислить a)3,7^2-3,6^2
б)(5+0,3)^2

Answer 1

$\tt a)\quad 3.7^2-3.6^2=(3.7-3.6)(3.7+3.6)=0.1\cdot7.3=\boxed{\tt 0.73}\\\\b)\quad (5+0.3)^2=5^2+2\cdot5\cdot0.3+0.3^2=25+10\cdot0.3+0.09=\\\\=25+3+0.09=\boxed{\tt 28.09}$