√1000 - 2√40
= √(100 × 10) - 2√(4 × 10)
= √100 × √10 - 2(√4 × √10)
= 10√10 - 2(2 × √10)
= 10√10 - 2(2√10)
= 10√10 - 4√10
= 6√10
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JAWABAN :
√1000 - 2√40
= √(100 × 10) - 2√(4 × 10)
= √100 × √10 - 2(√4 × √10)
= 10√10 - 2(2 × √10)
= 10√10 - 2(2√10)
= 10√10 - 4√10
= 6√10