Stick to the low ground and fire charged beam shots directly at the SA-X to destroy it. Your beam must be fully charged to damage it. As it approaches, Space Jump over the SA-X to the other side of the floor while charging your beam, and release the shot when you land.

Stay toward the left side of the room to protect yourself from its jumping attacks, and fire off several missiles diagonally to the sweet spot both before and after it attacks with missiles of its own. Destroy the oncoming missiles with your blaster, and then get yourself into position for your next attack.

Give Samus a long running start to let her booster charge up. When she's glowing, she'll be able to run through the blocks. If you press Down to stop and crouch when the Speed Booster is fully charged, you'll execute a rocket launch jump, which you can angle in any direction.