Question

0.12345平方+0.7655平方+2.469乘0.7655

Answer 1

原题应为：1.2345^2+0.7655^2+2.469*0.7655

原式=1.2345^2+0.7655^2+2*1.2345*0.7655

=(1.2345+0.7655)^2 *((a+b)^2=a^2+2ab+b^2)

=2^2

=4