已知多项式3x^3-2x^2+5+mx^2中不含x^2项,求代数式3m^2-[5m-(1/2m-3)+2m^2]
已知多项式3x^3-2x^2+5+mx^2中不含x^2项,求代数式3m^2-[5m-(1/2m-3)+2m^2]
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不含x^2项,就是说x^2项的系数为0
3x^3-2x^2+5+mx^2中不含x^2项,
则m-2=0
m=2
3m^2-[5m-(1/2m-3)+2m^2]
=3m^2-(5m-1/2m+3+2m^2)
=3m^2-5m+1/2m-3-2m^2
=m^2-9/2m-3
=2^2-(9/2)*2-3
=4-9-3
=-8
3x^3-2x^2+5+mx^2中不含x^2项,
则m-2=0
m=2
3m^2-[5m-(1/2m-3)+2m^2]
=3m^2-(5m-1/2m+3+2m^2)
=3m^2-5m+1/2m-3-2m^2
=m^2-9/2m-3
=2^2-(9/2)*2-3
=4-9-3
=-8
1年前
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