先化简,再求值,m后面的是平方,-2(mn-3m2)-[m2-5(mn-m2)+2mn],n=-2?
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发布时间:2024-10-02 21:20
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热心网友
时间:2024-10-10 10:58
原式=6m2-2mn-(m2-5mn+5m2+2mn)
=6m2-2mn-6m2+3mn
=mn
把m=1,n=-2代入,得
原式=-2,2,原式=-2(mn-3m2)-(m2-5mn+5m2+2mn)
=-2mn+6m2-m2-5mn-5m2-2mn
=mn
因为m=1,n=-2
所以原式=1*(-2)=-2,2,原式=-2(mn-3m²)-[m²-5(mn-m²)+2mn]
=-2mn+6m²-(m²-5mn+5m²+2mn)
=-2mn+6m²-(6m²-3mn)
=mn
=-2
化简=mn=-2,1,原题是不是这样
-2(mn-3m²)-[m²-5(mn-m²)+2mn]
=-2mn+6m²-m²+5mn-m²-2mn
=4m²+mn
=4×1²+1×(-2)
=2,1,原式=-2mn+6m²-(m²-5mn+5m²+2m)
=-2mn+6m²-m²+5mn-5m²-2m
=3mn-2m
把m=1和n=-2代入得
3×(1-2)-2×1=-3-2=-5
给个最佳~~谢啦,0,-2(mn-3m²)-[m²-5(mn-m²)+2mn]
= -2mn+6m²-(m²-5mn+5m²+2mn]
= -2mn+6m²-m²+5mn-5m²-2mn
=mn
把m=1,n=-2代入原式得,
原式=1×(-2)+1²
=-2+1
=-2,0,先化简,再求值,m后面的是平方,-2(mn-3m2)-[m2-5(mn-m2)+2mn],n=-2
M=1
热心网友
时间:2024-10-10 11:04
原式=6m2-2mn-(m2-5mn+5m2+2mn)
=6m2-2mn-6m2+3mn
=mn
把m=1,n=-2代入,得
原式=-2,2,原式=-2(mn-3m2)-(m2-5mn+5m2+2mn)
=-2mn+6m2-m2-5mn-5m2-2mn
=mn
因为m=1,n=-2
所以原式=1*(-2)=-2,2,原式=-2(mn-3m²)-[m²-5(mn-m²)+2mn]
=-2mn+6m²-(m²-5mn+5m²+2mn)
=-2mn+6m²-(6m²-3mn)
=mn
=-2
化简=mn=-2,1,原题是不是这样
-2(mn-3m²)-[m²-5(mn-m²)+2mn]
=-2mn+6m²-m²+5mn-m²-2mn
=4m²+mn
=4×1²+1×(-2)
=2,1,原式=-2mn+6m²-(m²-5mn+5m²+2m)
=-2mn+6m²-m²+5mn-5m²-2m
=3mn-2m
把m=1和n=-2代入得
3×(1-2)-2×1=-3-2=-5
给个最佳~~谢啦,0,-2(mn-3m²)-[m²-5(mn-m²)+2mn]
= -2mn+6m²-(m²-5mn+5m²+2mn]
= -2mn+6m²-m²+5mn-5m²-2mn
=mn
把m=1,n=-2代入原式得,
原式=1×(-2)+1²
=-2+1
=-2,0,先化简,再求值,m后面的是平方,-2(mn-3m2)-[m2-5(mn-m2)+2mn],n=-2
M=1
热心网友
时间:2024-10-10 10:58
原式=6m2-2mn-(m2-5mn+5m2+2mn)
=6m2-2mn-6m2+3mn
=mn
把m=1,n=-2代入,得
原式=-2,2,原式=-2(mn-3m2)-(m2-5mn+5m2+2mn)
=-2mn+6m2-m2-5mn-5m2-2mn
=mn
因为m=1,n=-2
所以原式=1*(-2)=-2,2,原式=-2(mn-3m²)-[m²-5(mn-m²)+2mn]
=-2mn+6m²-(m²-5mn+5m²+2mn)
=-2mn+6m²-(6m²-3mn)
=mn
=-2
化简=mn=-2,1,原题是不是这样
-2(mn-3m²)-[m²-5(mn-m²)+2mn]
=-2mn+6m²-m²+5mn-m²-2mn
=4m²+mn
=4×1²+1×(-2)
=2,1,原式=-2mn+6m²-(m²-5mn+5m²+2m)
=-2mn+6m²-m²+5mn-5m²-2m
=3mn-2m
把m=1和n=-2代入得
3×(1-2)-2×1=-3-2=-5
给个最佳~~谢啦,0,-2(mn-3m²)-[m²-5(mn-m²)+2mn]
= -2mn+6m²-(m²-5mn+5m²+2mn]
= -2mn+6m²-m²+5mn-5m²-2mn
=mn
把m=1,n=-2代入原式得,
原式=1×(-2)+1²
=-2+1
=-2,0,先化简,再求值,m后面的是平方,-2(mn-3m2)-[m2-5(mn-m2)+2mn],n=-2
M=1