若mx^2a+2 y^2与0.4xy^3b+4的核为零,求代数式 10abm-1/4{3a^2b-[40abm-(2ab^2-3a^2b)]}的值帮帮我吧谢谢
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![若mx^2a+2 y^2与0.4xy^3b+4的核为零,求代数式 10abm-1/4{3a^2b-[40abm-(2ab^2-3a^2b)]}的值帮帮我吧谢谢](/uploads/image/z/3816947-11-7.jpg?t=%E8%8B%A5mx%5E2a%2B2+y%5E2%E4%B8%8E0.4xy%5E3b%2B4%E7%9A%84%E6%A0%B8%E4%B8%BA%E9%9B%B6%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F+10abm-1%2F4%7B3a%5E2b-%5B40abm-%282ab%5E2-3a%5E2b%29%5D%7D%E7%9A%84%E5%80%BC%E5%B8%AE%E5%B8%AE%E6%88%91%E5%90%A7%E8%B0%A2%E8%B0%A2)
若mx^2a+2 y^2与0.4xy^3b+4的核为零,求代数式 10abm-1/4{3a^2b-[40abm-(2ab^2-3a^2b)]}的值帮帮我吧谢谢
若mx^2a+2 y^2与0.4xy^3b+4的核为零,求代数式 10abm-1/4{3a^2b-[40abm-(2ab^2-3a^2b)]}的值帮帮我吧谢谢
若mx^2a+2 y^2与0.4xy^3b+4的核为零,求代数式 10abm-1/4{3a^2b-[40abm-(2ab^2-3a^2b)]}的值帮帮我吧谢谢
mx^(2a+2) y^2与0.4xy^(3b+4)的和为零
所以m=-0.4
2a+2=1,2=3b+4
a=-1/2,b=-2/3
化简代数式 10abm-1/4{3a^2b-[40abm-(2ab^2-3a^2b)]}
=10abm-1/4(3a^2b-40abm+2ab^2-3a^2b)
=10abm-1/4(-40abm+2ab^2)
=10abm+10abm-(1/2)ab^2
=20abm-(1/2)ab^2
将m=-0.4,a=-1/2,b=-2/3代入
原式=20*(-1/2)(-2/3)*(-0.4)-(1/2)*(-1/2)(-2/3)^2
=-8/3+1/9
=-23/9
mx^(2a+2) y^2与0.4xy^(3b+4)的和为零
所以m=-0.4
2a+2=1,2=3b+4
a=-1/2,b=-2/3
化简代数式 10abm-1/4{3a^2b-[40abm-(2ab^2-3a^2b)]}
=10abm-1/4(3a^2b-40abm+2ab^2-3a^2b)
=10abm-1/4(-40abm+2ab^2)...
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mx^(2a+2) y^2与0.4xy^(3b+4)的和为零
所以m=-0.4
2a+2=1,2=3b+4
a=-1/2,b=-2/3
化简代数式 10abm-1/4{3a^2b-[40abm-(2ab^2-3a^2b)]}
=10abm-1/4(3a^2b-40abm+2ab^2-3a^2b)
=10abm-1/4(-40abm+2ab^2)
=10abm+10abm-(1/2)ab^2
=20abm-(1/2)ab^2
将m=-0.4,a=-1/2,b=-2/3代入
原式=20*(-1/2)(-2/3)*(-0.4)-(1/2)*(-1/2)(-2/3)^2
=-8/3+1/9
=-23/9
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