(1)4a+b-3a-2b a=-2 ,b=-1 (2)3a+abc-1/2c的二次方,a=-1/6,b=2,c=-3.
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/26 04:13:48
![(1)4a+b-3a-2b a=-2 ,b=-1 (2)3a+abc-1/2c的二次方,a=-1/6,b=2,c=-3.](/uploads/image/z/998225-17-5.jpg?t=%281%294a%2Bb-3a-2b+a%3D-2+%2Cb%3D-1+%282%293a%2Babc-1%2F2c%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9%2Ca%3D-1%2F6%2Cb%3D2%2Cc%3D-3.)
(1)4a+b-3a-2b a=-2 ,b=-1 (2)3a+abc-1/2c的二次方,a=-1/6,b=2,c=-3.
(1)4a+b-3a-2b a=-2 ,b=-1 (2)3a+abc-1/2c的二次方,a=-1/6,b=2,c=-3.
(1)4a+b-3a-2b a=-2 ,b=-1 (2)3a+abc-1/2c的二次方,a=-1/6,b=2,c=-3.
(1) 4a+b-3a-2b=(4a-3a)-(2b-b).
=a-b.
=(-2)-(-1)
=-2+1.
-1.
(2).3a+abc-(1/2)c^2=a(3+bc)-(1/2)c^2.
=(-1/6)[3+2*(-3)]-(1/2)*(-3)^2.
=(-1/6)*(-3)-9/2.
=1/2-9/2.
=-8/2.
=-4.