3m的平方等于6m怎么用因式分解法解
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(3m+2n)的平方-(m-n)的平方=(3m+2n+m-n)(3m+2n-m+n)=(4m+n)(2m+3n)
(x加2)的平方减3x减6等于0(x+2)²-3x-6=0x²+4x+4-3x-6=0x²+x-2=0(x+2)(x-1)=0x1=-2x2=1
解x^2+2x-8=0(x+4)(x-2)=0x=2或x=-4
(3m+2n)^2-(2m-3n)^2=[(3m+2n)+(2m-3n)][(3m+2n)-(2m-3n)]=(3m+2n+2m-3n)(3m+2n-2m+3n)=(5m-n)(m+5n)
(2x-1)^2=(3-x)^2(2x-1)^2-(3-x)^2=0[(2x-1)+(3-x)]*[(2x-1)-(3-x)]=0(2x-1)+(3-x)=0或(2x-1)-(3-x)=0x=-2或x
(m-3)-5(m-3)=0【移项】(m-3)(m-8)=0【提公因式】∴m-3=0或m-8=0∴原方程的解是m1=3,m2=8
C、m(a-2)(m-1)m^(a-2)+m(2-a)=m^(a-2)-m(a-2)=m(a-2)(m-1)
方法一:平方差公式(m+n)²-(m-n)²=[(m+n)+(m-n][(m+n)-(m-n)]=2m×2n=4mn方法二:展开(m+n)²-(m-n)²=(m
x²-(2m+1)x+m²+m=0[x-(m+1)](x-m)=0(十字相乘法)解得x1=m+1,x2=m
100m²-(m²+25)²=[10m-(m²+25)][10m+(m²+25)]=(10m-m²-25)(10m+m²+25)=
m=根号3和-根号3
m²-3m≥0m﹙m-3﹚≥0①m≥0,m-3≥0,解得:m≥3②m≤0m-3≤0解得:m≤0∴原不等式的解集是:m≤0.或m≥3.
(3m+2n)的平方-(3m-2n)的平方=(3m+2n+3m-2n)(3m+2n-3m+2n)=6m×4n=24mn;如果本题有什么不明白可以追问,这样可以么?再问:中间没有减号!(3m+2n)的平
(6m^2-4m-3)+(2m^2-4m+1)=6m^2-4m-3+2m^2-4m+1=8m^2-8m-2
m²-n²+2m+2n原式=(m²-n²)+(2m+2n)=(m-n)(m+n)+2(m+n)=(m+n)(m-n+2)3ay-6ax-4x²+y
m的平方(a-3)+4(3-a)=m^2(a-3)-4(a-3)=(a-3)(m^2-4)=(a-3)(m+2)(m-2)
3y-6y=0y-2y=0y(y-2)=0y1=0y2-2=0y2=2所以y1=0;y2=2