dl等于多少m的方-搜答案-搜搜考试网

因为m²+m-1=0所以m²=1-m所以m³+2m²+2009=m(1-m)+2m²+2009=m²+m+2009=1+2009=2010

m^12+6*n*m^11+12*n^2*m^10+2*n^3*m^9-27*n^4*m^8-36*n^5*m^7+36*n^7*m^5+27*n^8*m^4-2*n^9*m^3-12*n^10*m^

2.15

1mg/dL等于多少g/L

1mg/dl=0.01g/l

根据题意m^2=1-m所以m^3+2m^2+2007=m^2(m+2)+2007=(1-m)(m+2)+2007=-m^2-m+2+2007=-(1-m)-m+2009=-1+2009=2008

|2M+1|+(N+2)^4=0∵|2M+1|≥0,(N+2)^4≥0∴2M+1=N+2=0∴M=-½,N=-2∴MN=1再问：不是等于负40么再答：题目给的不清楚啊|2M+1|+N+2=0

1/(49-m^2)÷1/(m^2-7m)=-1/(m^2-49)*(m^2-7m)=-1/[(m+7)(m-7)*m(m-7)=-m/(m+7)

说明：M2表示M的2次方,M3表示M的3次方∵M2+M-1=0∴M2+M=1∴M3+2M2+2007=M3+2M2-1+2008=M3+2M2-(M2+M)+2008=M3+2M2-M2-M+2008

m+1/m=3平方(m+1/m)^2=9m^+2+1/m^2=9m^2+1/m^2=7m^2-2+1/m^2=5(m-1/m)^2=5m-1/m=±√5

1ug/ml等于多少g/dl

1ug/ml=1×10^-6g/10^-2dl=10^-4g/dl1ug=1×10^-6g1ml=10^-2dl=0.1l

m²-√10m+1=0同除以mm+1/m=√10m^4+m^(-4)=m^4+1/m^4=(m²+1/m²)²-2=[(m+1/m)²-2]²

4m的三次方n减5mn的三次方=mn(4m²-5n²)

m²+2n-mn-2m=m²-mn-2m+2n=m(m-n)-2(m-n)=(m-2)(m-n)

m的四次方

等于0啊……

(n-m)(n-m)(n-m)/(m-n)(m-n)(m-n)=-(m-n)(m-n)(m-n)/(m-n)(m-n)(m-n)=-1

m=1/2m=±√2/2(正负2分之根号2）

每升等于1000分升,每摩尔等于1000000微摩尔.每克等于1000毫克.1mol=1,000mmol=1,000,000umol=1,000,000,000nmol=1,000,000,000,0

m^2-1=0m^2=1m=+1或-1(i)m=1:m^3+2m^2+2=1+2+2=5(ii)m=-1:m^3+2m^2+2=-1+2+2=3