1.已知A=3x³-4xyz,B=2y³-3z³-4xyz,C=-x³+3y³-3xyz,且（x+1）²+|y-1|+8z的四次方=0.1）求想x、y、z的值2）求6A-1/2{2B-3[1/4(2B-3C)-(-C+2A)]}的值2.1)x>-2,且x

Question

1.已知A=3x³-4xyz,B=2y³-3z³-4xyz,C=-x³+3y³-3xyz,且（x+1）²+|y-1|+8z的四次方=0.
1）求想x、y、z的值
2）求6A-1/2{2B-3[1/4(2B-3C)-(-C+2A)]}的值
2.1)x>-2,且x

Answer 1

1.已知A=3x³-4xyz,B=2y³-3z³-4xyz,C=-x³+3y³-3xyz,
且（x+1）²+|y-1|+8z的四次方=0.
由绝对值,偶次方为非负数,和为0,只有分别等于0
则x=-1,y=1 ,z=0
A=-3,B=2,C=4
1）求想x、y、z的值
2）求6A-1/2{2B-3[1/4(2B-3C)-(-C+2A)]}的值
=6A-1/2{2B-3[B/2-3C/4+C-2A]}
=6A-1/2{2B-3B/2-C/4+2A]}
=6A-B/4+C/8-A
=5A-B/4+C/8
=-15-1/2+1/2
=-15
2.1)x>-2,且x