已知:ab互为相反数,c,d互为倒数,x=3(a-1)-(a-2b),y=cd²+d²-(d²+d-2),求3分之2x-y-6分之3x+2y的值.
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/22 06:43:48
![已知:ab互为相反数,c,d互为倒数,x=3(a-1)-(a-2b),y=cd²+d²-(d²+d-2),求3分之2x-y-6分之3x+2y的值.](/uploads/image/z/1527064-16-4.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9Aab%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2Cc%2Cd%E4%BA%92%E4%B8%BA%E5%80%92%E6%95%B0%2Cx%EF%BC%9D3%28a%EF%BC%8D1%29-%28a-2b%29%2Cy%3Dcd%26%23178%3B%2Bd%26%23178%3B%EF%BC%8D%28d%26%23178%3B%EF%BC%8Bd%EF%BC%8D2%29%2C%E6%B1%823%E5%88%86%E4%B9%8B2x%EF%BC%8Dy%EF%BC%8D6%E5%88%86%E4%B9%8B3x%EF%BC%8B2y%E7%9A%84%E5%80%BC.)
已知:ab互为相反数,c,d互为倒数,x=3(a-1)-(a-2b),y=cd²+d²-(d²+d-2),求3分之2x-y-6分之3x+2y的值.
已知:ab互为相反数,c,d互为倒数,x=3(a-1)-(a-2b),y=cd²+d²-(d²+d-2),
求3分之2x-y-6分之3x+2y的值.
已知:ab互为相反数,c,d互为倒数,x=3(a-1)-(a-2b),y=cd²+d²-(d²+d-2),求3分之2x-y-6分之3x+2y的值.
已知:ab互为相反数,
a+b=0;
c,d互为倒数,
cd=1;
x=3(a-1)-(a-2b),
=3a-3-a+2b
=2a+2b-3
=-3;
y=cd²+d²-(d²+d-2),
=cd²+d²-d²-d+2
=d+d²-d²-d+2
=2;
求3分之2x-y-6分之3x+2y的值.
=(4x-2y-3x-2y)/6
=(x-4y)/6
=(-3-4×2)/6
=-11/6;
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,
ab互为相反数
∴a+b=0
c,d互为倒数
∴cd=1
x=3(a-1)-(a-2b)=3a-3-a+2b=2a+2b-3=2(a+b)-3=-1
y=cd²+d²-(d²+d-2)=d+d²-d²-d+2=2 cd用1代替 cd²=cd×d=d
...
全部展开
ab互为相反数
∴a+b=0
c,d互为倒数
∴cd=1
x=3(a-1)-(a-2b)=3a-3-a+2b=2a+2b-3=2(a+b)-3=-1
y=cd²+d²-(d²+d-2)=d+d²-d²-d+2=2 cd用1代替 cd²=cd×d=d
3分之2x-y-6分之3x+2y
=(4x-2y-3x-2y)/6
=(x-4y)/6
=(-1-8)/6
=-3/2
收起