(2a+b)²-4(a-2b)²,其中a=-1,b=3
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(2a+b)²-4(a-2b)²,其中a=-1,b=3
(2a+b)²-4(a-2b)²,其中a=-1,b=3
(2a+b)²-4(a-2b)²,其中a=-1,b=3
(2a+b)²-4(a-2b)²,其中a=-1,b=3
(2a+b)²-4(a-2b)²
=(2a+b+2a-4b)(2a+b-2a+4b)
=(4a-3b)5b
=5x3x[4x(-1)-3x3]
=15x(-13)
=-195
(2a+b)²-4(a-2b)²
=[(2a+b)+2(a-2b)][(2a+b)-2(a-2b)]
=(4a-3b)(5b)
=5b(4a-3b)
=5×3×(-4-9)
=15×(-13)
=-195
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