Question

2.5×195 use algebraic identity​

Answer 1

Answer:

your answer is 487.5

pls make me branlist

Answer 2

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