复数的加法法则

规定：(a+bi)+(c+di)=(a+c)+(b+d)i

1、(1+2i)+(-2+3i)=

口算：

2、(-2+3i)+(1+2i)=

3、[(-2+3i)+(1+2i)]+(3+4i) =

4、(-2+3i)+[(1+2i)+(3+4i)] =

-1+5i

-1+5i

(-1+5i)+(3+4i)= 2+9i

(-2+3i)+(4+6i) = 2+9i