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