2.5×195 use algebraic identity
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Answer:
your answer is 487.5
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Answer:
20.5×19.5
= (20+0.5)(20−0.5) [Using, (a+b)(a−b)=a
2
−b
2
]
= (20)
2
−(0.5)
2
= 400−0.25
= 399.75