计算:(2a-3b)∧2-4a(a-2b); (m-2n+3)(m+2n-3)

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计算:(2a-3b)∧2-4a(a-2b); (m-2n+3)(m+2n-3)
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计算:(2a-3b)∧2-4a(a-2b); (m-2n+3)(m+2n-3)
计算:(2a-3b)∧2-4a(a-2b); (m-2n+3)(m+2n-3)

计算:(2a-3b)∧2-4a(a-2b); (m-2n+3)(m+2n-3)
(2a-3b)∧2-4a(a-2b);
=4a²-12ab+9b²-4a²+8ab
=-4ab+9b²
(m-2n+3)(m+2n-3)
=[m-(2n-3)][m+(2n-3)]
=m²-(2n-3)²
=m²-(4n²-12n+9)
=m²-4n²+12n-9