If |z1-1|<1, |z2-2|<2,|z3-3|<3 then |z1+...

If `|z_1-1|<1`, `|z_2-2|<2`,`|z_3-3|<3` then `|z_1+z_2+z_3|`

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`|z-1|<1`
center(1,0) and` r_1=1`
`|z_2-2|<2`
`C_2(2,0) and r_2=2`
`|z_3-3|<3`
`c_3(3,0) and r_3=3`
`|Z_1| in(0,2)`
`|Z_2| in (0,4)`
...

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