2(a-b)(a+b)-(2a-b)(a+2b),其中a=0.25,b=-4

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2(a-b)(a+b)-(2a-b)(a+2b),其中a=0.25,b=-4

2(a-b)(a+b)-(2a-b)(a+2b),其中a=0.25,b=-4
2(a-b)(a+b)-(2a-b)(a+2b),其中a=0.25,b=-4

2(a-b)(a+b)-(2a-b)(a+2b),其中a=0.25,b=-4
2(a-b)(a+b)-(2a-b)(a+2b),
= 2a² -2b² -2a² -3ab +2b²
= -3ab
= -3×0.25×(-4)
= 3
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2(a-b)(a+b)-(2a-b)(a+2b)
=2（a²-b²)-(2a²+4ab-ab-2b²)
=2a²-2b²-2a²-3ab+2b²
=-3ab

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