how to simplify

  1. root 50 - root 98 + root 162
  2. 7 root 48 - root 72 - root 27+ 3 root 2
  3. 1/2 root 243 - root27/4
  4. root 8/9 -3 root 1/2 + 5 root 9/8

plz help me for this.....

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