13 = √ ( √ + ) − = √ + √ = √ + √ 7. √ +√ = √ +√ x √ −√ √ −√ = (√ −√ ) − = − (√ − √ ) = √ − √ 8. √ √ − √ = √ √ − √ x √ + √ √ + √ = √ (√ + √ ) − = √ + √ − = − √ − √
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