【计算】(2m-5)(2m+5)-(2m+1)(2m-3)-2(m-1)^2

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/15 07:30:45
【计算】(2m-5)(2m+5)-(2m+1)(2m-3)-2(m-1)^2【计算】(2m-5)(2m+5)-(2m+1)(2m-3)-2(m-1)^2【计算】(2m-5)(2m+5)-(2m+1)(

【计算】(2m-5)(2m+5)-(2m+1)(2m-3)-2(m-1)^2
【计算】(2m-5)(2m+5)-(2m+1)(2m-3)-2(m-1)^2

【计算】(2m-5)(2m+5)-(2m+1)(2m-3)-2(m-1)^2
(2m-5)(2m+5)-(2m+1)(2m-3)-2(m-1)^2
=4m²-25-(4m²-6m+2m-3)-2(m²-2m+1)
=4m²-25-4m²+4m+3-2m²+4m-2
=-2m²+8m-24

(2m-5)(2m+5)-(2m+1)(2m-3) - 2(m-1)^2
=4m²-25-(4m²-4m-3) - (2m²-4m+2)
=4m²-25-4m²+4m+3 -2m²+4m-2
=-24+8m -2m²
=-2(m²-4m+12)