m-n=7,mn=6,m^2+n^2
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m-n=7,mn=6,m^2+n^2
m-n=7,mn=6,m^2+n^2
m-n=7,mn=6,m^2+n^2
m^2+n^2
=(m-n)^2+2mn
=7^2+2*6
=49+12
=61
等于61
前面的括号的平方+2倍的mn
m²+n²
=m²-2mn+n²+2mn
=(m-n)²+2mn
=7²+2x6
=61
m^2+n^2=(m-n)^2+2mn=49+12=61
m-n=7
(m-n)²=7²
m²-2mn+n²=49
(m²+n²)-2mn=49
将mn=6代入(m²+n²)-2mn=49,得:
(m²+n²)-2×6=49
(m²+n²)-12=49
m²+n²=49+12
m²+n²=61
m-n=7 mn=-5求(3m+5n+4mn)-(2n-4n+6mn)
M+N=6 MN=-7 ,那么M^2N+MN^2=?
已知mn-n=15,m-mn=6,则m-n=_,-2mn+m+n=_
已知mn-m=15,n-mn=6则n-m=( ),-2mn+m+n=( )
mn-n=15 ; m-mn=6 那么m-n=( ) ; -2mn+m+n=( )
已知实数m,n,且m>n>0,m²+n²=4mn,则m²﹣n²/mn的值等于∵(m+n)²=m²+2mn+n²,(m-n)²=m²-2mn+n²,m²+n²=4mn.(m+n)²=6mn(m-n)²=2mn(m+n)²(m-n)²=12m²n²mm³-2m
1/M+1/N=5 (3M+MN+2N) / (M-MN=3N)
已知m-n=7,mn=-5,n=?根据m-n=7,mn=-5,求{3m-5n+4mn}-{2m-4n=6mn}的值
(3m-5n+4mn)-(2m-4n+6mn)其中m-n=7,mn=-5
(3m-5n+4mn)-(2m-4n+6mn) mn=-5 m-n=7快帮我打答吧!谢谢了!
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