作业帮-16(2x+y)^2+25(x-2y)^24m^3-9mn^218(a-b)^3-8(a+2b)^2(a-b)
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-16(2x+y)^2+25(x-2y)^24m^3-9mn^218(a-b)^3-8(a+2b)^2(a-b)
-16(2x+y)^2+25(x-2y)^2
4m^3-9mn^2
18(a-b)^3-8(a+2b)^2(a-b)
-16(2x+y)^2+25(x-2y)^24m^3-9mn^218(a-b)^3-8(a+2b)^2(a-b)
第一题：原式=25(x-2y)^2-16(2x+y)^2
=（5x-10y)^2-(8x+4y)^2
=(5x-10y+8x+4y)(5x-10y-8x-4y)
后面自己做啦.
第二题：原式=m(4m^2-9n^2)
=m(2m+3n)(2m-3n)
第三题：提出公因式2（a-b）后,得
2（a-b)[3(a-b)-2(a+2b)][3(a-b)+2(a+2b)]
后面自己做哦.
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25(2x+y)^2-16(x-2y)^2
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