1-m² 10mn-25n²分解因式
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(x+2y)"-x"-2xy=(x+2y)"-x"-2xy-y"+y"=(x+2y)"-(x+y)"+y"=(x+2y-x-y)(x+2y+x+y)+y"=y(2x+3y)+y"=y(2x+3y+y)
(2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)先去括号=2mn+2m+3n-3mn-2n+2m-m-4n-mn合并同类项=-2mn+3m-3n=-2mn+3(m-n)把m-n=2,
再答:求采纳!再问:。。。。。
m(m+n)²-4mn²=m[(m+n)²-4n²]=m[(m+n)+2n][(m+n)-2n]=m(m+3n)(m-n)
先合并同类项,得3(m-n)-6mn+9,代入已知数据,有结果27
m+m^2-mn^2+2m^2n=m(1+m+2mn-n^2)
(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)=-2mn+2m+3n-3mn-2n+2m-m-4n-mn=(-2mn-3mn-mn)+(2m+2m-m)+(3n-2n-4n)=-
再答:原式=2m(n+1)-(n+1)2=2(m-1)(n+1)
m-n-mn+1,=(m-mn)+(1-n),=m(1-n)+(1-n),=(m+1)(1-n).
2㎡—mn+2m+n—n²=2m²-(n-2)m+n(1-n)=(2m+n)(m+(1-n))=(2m+n)(m-n+1)此题如仍有疑问,欢迎追问!再问:2步到3步再详细一点再答:
2m^2n^2-2n^2+(mn-1)(m-1)^2=2n^2(m^2-1)+(mn-1)(m-1)^2=2n^2(m-1)(m+1)+(mn-1)(m-1)^2=(m-1)[2n^2(m+1)+(m
1:2m²n-3mn²=mn(2m-3n)……………………(√)2:-2a²-4a=-2(a+2)…………………………(×) -2a²-4a=-2a(a+2)
m^2n-2mn^2+mn=mn(m-2n+1)
mn+m^2n^2+m^2n+mn^2=m^2n(n+1)+mn(n+1)=mn(n+1)(m+1)或:mn+m^2n^2+m^2n+mn^2=mn(mn+m+n+1)=mn(n+1)(m+1)
已知:a^3-b^3=(a+b)(a^2+ab+b^2)令a=1/5m,b=1/2n则原式==(a+b)(a^2+ab+b^2)=a^3-b^3=(1/5m)^3-(1/2n)^3
公因式是mn(x-y)^n所以原式=mn(x-y)^n(n-m)两项中m最低是1次,n最低原式1次而x-y是n和n+1次,则最低是n次所以公因式是mn(x原式=mn(x-y)^n*(-m)mn(x-y
-4m^2n^3+12m^3n^2-2mn=2mn(6m²n-2mn²-1)不明白,可以追问如有帮助,记得采纳如追加其它问题,采纳本题后点击想我求助,谢谢祝学习进步!
m²+2n-mn-2m=m(m-n)-(2m-2n)=m(m-n)-2(m-n)(m-n)(m-2)
-m²+4mn-4n²=-(m²-4mn+4n²)=-(m-2n)²
m²+4mn+4n²=(m+2n)²