Use the cube to block the lasers (you can grab it from any range). Do not walk in front of a robot without a cube, do not walk in front of 2 robots even with a cube.

1-robot room you place a blue portal at the start, grab the cube and use it to block the laser, orange-portal back to turn off the laser.

In transitioning to the 2-robot room, the solution is to place a blue portal that goes to the very start of the level, then place an orange portal on the white wall that has a laser on it, walking into the room with the cube, and only then place a blue portal that is near the cube.

In the 2-robot room, the solution is to shutdown all lasers, make a blue portal at the upper level and orange at the exit, put the cube at the exit, turn on all lasers, walk to the exit with the cube, teleport to the upper level, drop the cube on its button, teleport back to the exit, place the orange portal on the white wall that has a laser on it.