3²-1²=4*2 7²-3²=10*4 10²-5²=15*5 a²-b²=( )
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3²-1²=4*2 7²-3²=10*4 10²-5²=15*5 a²-b²=( )
3²-1²=4*2 7²-3²=10*4 10²-5²=15*5 a²-b²=( )
3²-1²=4*2 7²-3²=10*4 10²-5²=15*5 a²-b²=( )
a²-b²=(a+b )(a-b)
(a+b)(a-b)
a²-b²=(a+b)(a-b)
(a+b)*(a-b)
(a+b)(a-b)