a²(x-y)+b²(y-x) ; 2-½x² ;(a+2b)²-4(
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a²(x-y)+b²(y-x) ; 2-½x² ;(a+2b)²-4(a-b)²; 9(a+b)²-4(a-b)²
²(平方) ½(二分之一)
²(平方) ½(二分之一)
a²(x-y)+b²(y-x)
=(x-y)(a²-b²)
=(x-y)(a+b)(a-b)
2-½x²
=2(1- x²/4)
=2(1+½x)(1-½x)
(a+2b)²-4(a-b)²
=[(a+2b)+2(a-b)][(a+2b)-2(a-b)]
=(a+2b+2a-2b)(a+2b-2a+2b)
=3a(4b-a)
9(a+b)²-4(a-b)²
=[3(a+b)+2(a-b)][3(a+b)-2(a-b)]
=(3a+3b+2a-2b)(3a+3b-2a+2b)
=(5a+b)(a+5b)
=(x-y)(a²-b²)
=(x-y)(a+b)(a-b)
2-½x²
=2(1- x²/4)
=2(1+½x)(1-½x)
(a+2b)²-4(a-b)²
=[(a+2b)+2(a-b)][(a+2b)-2(a-b)]
=(a+2b+2a-2b)(a+2b-2a+2b)
=3a(4b-a)
9(a+b)²-4(a-b)²
=[3(a+b)+2(a-b)][3(a+b)-2(a-b)]
=(3a+3b+2a-2b)(3a+3b-2a+2b)
=(5a+b)(a+5b)
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