(m-2n+3)(m+2n-3)等于多少

2025-06-23 06:08:27
推荐回答(4个)
回答1:

回答2:

回答3:

回答4:

(m-2n+3)(m+2n-3)
=【m-(2n-3)】(m+2n-3)
=m²-(2n-3)²
=m²-(4n²-12n+9)
=m²-4n²+12n-9)