作业帮一直A=-3M^2+M-1,B=1/2(-6M^3+4/5M^2-2M)+3,求5A-3B-[-A-(2B-5A)]rtrtrt
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![一直A=-3M^2+M-1,B=1/2(-6M^3+4/5M^2-2M)+3,求5A-3B-[-A-(2B-5A)]rtrtrt](/uploads/image/z/11687897-65-7.jpg?t=%E4%B8%80%E7%9B%B4A%3D-3M%5E2%2BM-1%2CB%3D1%2F2%28-6M%5E3%2B4%2F5M%5E2-2M%29%2B3%2C%E6%B1%825A-3B-%5B-A-%282B-5A%29%5Drtrtrt)
一直A=-3M^2+M-1,B=1/2(-6M^3+4/5M^2-2M)+3,求5A-3B-[-A-(2B-5A)]rtrtrt
一直A=-3M^2+M-1,B=1/2(-6M^3+4/5M^2-2M)+3,求5A-3B-[-A-(2B-5A)]
rtrtrt
一直A=-3M^2+M-1,B=1/2(-6M^3+4/5M^2-2M)+3,求5A-3B-[-A-(2B-5A)]rtrtrt
5A-3B-[-A-(2B-5A)]
=5A-3B+A+(2B-5A)
=6A-3B+2B-5A
=A-B
=(-3M^2+M-1)-[1/2(-6M^3+4/5M^2-2M)+3]
=-3M^2+M-1-1/2(-6M^3+4/5M^2-2M)-3
=-3M^2+M-4+3M^3-2/5M^2+M
=-2/5M^2+2M-4