减去-3m等于5m²-3m-5的式子是()A.5(m²-1) B.5m²-6m-5 C.5(m²+1) D.-(5m²+6m-5)

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减去-3m等于5m²-3m-5的式子是()A.5(m²-1)   B.5m²-6m-5     C.5(m²+1)   D.-(5m²+6m-5)
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减去-3m等于5m²-3m-5的式子是()A.5(m²-1) B.5m²-6m-5 C.5(m²+1) D.-(5m²+6m-5)
减去-3m等于5m²-3m-5的式子是()
A.5(m²-1) B.5m²-6m-5 C.5(m²+1) D.-(5m²+6m-5)

减去-3m等于5m²-3m-5的式子是()A.5(m²-1) B.5m²-6m-5 C.5(m²+1) D.-(5m²+6m-5)
∵f(m)-3m=5m²-3m-5
∴f(m)=5m²-5=5(m²-1)
∴选A

5m²-3m-5+(-3m)=5m²-6m-5

B

A