计算 (-1 2m^-2n)-3*(-m^3n^-2)-2
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原式=[3-(m-n)][3+(m-n)]-[2-(m-n)][2+(m-n)]=[3²-(m-n)²]-[2²-(m-n)²]=9-(m-n)²-4
您好:(m+4n)(m-n)-6(m+2n)(m-3n)=m²+3mn-4n²-6m²+6mn+36n²=-5m²+9mn+32n²不明白,
[5(m+n)2(m-n)]3÷【3(m+n)2(n-m)]2=125(m+n)的6次方(m-n)³÷9(m+n)的4次方(m-n)²=125/9(m+n)²(m-n)如
(m+n)^3-(n+m)(m-n)^2=(m+n)[(m+n)^2-(m-n)^2]=(m+n)[(m+n+m-n)(m+n-m+n)]=(m+n)(2m+2n)=2(m+n)^2
(4m-n)(3m+2n)=12m²-3mn+8mn-2n²=12m²+5mn-2n²
计算:(2m+3n)(m-2n)=【2m²-mn-6n²】
[2M-3N]²-2M+3N=[2M-3N]²-(2M-3N)=(2M-3N)(2M-3N-1)=4M²-6MN-2M-6MN+9N²+3N=4M²-
5(m+n)(m-n)-2(m+n)^2-3(m-n)^2=5(m^2-n^2)-2(m^2+2mn+n^2)-3(m^2-2mn+n^2)=5m^2-5n^2-2m^2-4mn-2n^2-3m^2+
2(m-n平方)
4(m+n)^2·(-m-n)^3-(m+n)(-m-n)^4+5(m+n)^5=-4(m+n)^2·(m+n)^3-(m+n)(m+n)^4+5(m+n)^5=-4(m+n)^5-(m+n)^5+5
(m-n)^3+(n-m)m^2=(m-n)^3-(m-n)m^2=(m-n)[(m-n)^2-m^2]=(m-n)(m-n+m)(m-n-m)=-n(m-n)(2m-n)=-n(2m^2-3mn+n
4(m+n)^2乘(-m-n)^3-(m+n)(-m-n)^4+5(m+n)^5=-4(m+n)^5-(m+n)^5+5(m+n)^5=0
(3m+2n)(7m-6n)=3mx7m-3mx6n+2nx7m-2nx6n=21m²-18mn+14mn-12n²=21m²-4mn-12n²希望可以帮到你.
原式=【(m-n)(n-m)】^2=[m(n-m)-n(n-m)]^2=[mn-m^2-n^2+mn]^2=(2mn-m^2-n^2)^2=(m-n)^4
:(2m-n)(m+2n)-(m+n)的平方+3n的平方=2m^2+3nm-2n^2-m^2-2nm-n^2+3n^2=m^2+nm
=4*(m+n)^2*(-1)*(m+n)^3-(m+n)*(-1)^4*(m+n)^4+5(m+n)^5=-4(m+n)^5-(m+n)^5+5(m+n)^5=0
(m-2n+3)(m+2n-3)=[(m-2n)+3][(m+2n)-3]=(m-2n)^2-3^2=m^2-4mn+4n^2-9
我也没有用简便方法,是直接算出来的,希望能采纳.如下:(3m-n)(-3m-n)-(m-2n)^2-(m-2n)(2m-n)=-9m^2+3mn-3mn+n^2-m^2+4mn-4n^2-2m^2+4
(3m-4n)(4n+3m)-(2m-n)(2m+2)=9m^2-16n^2-4m^2-4m+2mn+2n=5m^2-16n^2-4m+2mn+2n再问:计算:(4a-b^2)^2再答:(4a-b^2