1) 4а²- 16b²
2) (9-1,6)(9+1.6)=
3) (0,5x-0,7y)(0,5x+0,7y)
(2а+4b) (2a-4b) = 4a²-16b²
81²-2,56 = (9+1,6)(9-1,6)
0,25x²-0,49y² = (0,5x+0,7y)(0,5x-0,7y)
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Answers & Comments
1) 4а²- 16b²
2) (9-1,6)(9+1.6)=
3) (0,5x-0,7y)(0,5x+0,7y)
(2а+4b) (2a-4b) = 4a²-16b²
81²-2,56 = (9+1,6)(9-1,6)
0,25x²-0,49y² = (0,5x+0,7y)(0,5x-0,7y)