i1+i22\frac{i_{1}+i_{2}}{\sqrt{2}}2i1+i2
i12+i222\sqrt{\frac{i_{1}^{2}+i_{2}^{2}}{2}}2i12+i22
i1+i22\frac{i_{1}+i_{2}}{2}2i1+i2
i12+i222\sqrt{\frac{i_{1}^{2}+i_{2}{ }^{2}}{2}}2i12+i22