已知:多项式x²-(3k-1)xy-3k²+3mxy-8中不含xy项,求8^k×4÷2^3m+2
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/16 22:35:05
![已知:多项式x²-(3k-1)xy-3k²+3mxy-8中不含xy项,求8^k×4÷2^3m+2](/uploads/image/z/2535020-44-0.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9A%E5%A4%9A%E9%A1%B9%E5%BC%8Fx%26%23178%3B-%EF%BC%883k-1%EF%BC%89xy-3k%26%23178%3B%2B3mxy-8%E4%B8%AD%E4%B8%8D%E5%90%ABxy%E9%A1%B9%2C%E6%B1%828%5Ek%C3%974%C3%B72%5E3m%2B2)
xRJ@|
qI[0`6/"
uR<"A[/y6)H#I̦'tp}~xx鮯B0gBIV% #>s߹-0m$fQP&&}mUZ2W7~,&@E 0dJ?s$%NPî!ˊTB6+nKUHT4l$*YH/!jnj͝=h`E<^/*n+$ݧx^QKbY/}l!Ո'`1
Čq"ifDJQr r=jTDקhO$G=}Uj%lX
已知:多项式x²-(3k-1)xy-3k²+3mxy-8中不含xy项,求8^k×4÷2^3m+2
已知:多项式x²-(3k-1)xy-3k²+3mxy-8中不含xy项,求8^k×4÷2^3m+2
已知:多项式x²-(3k-1)xy-3k²+3mxy-8中不含xy项,求8^k×4÷2^3m+2
-(3k-1)+3m=0
3m-3k+1=0
3m-3k=-1
8k+1次方×4÷2的3m+2次方
=8^(k+1)×4÷2^(3m+2)
=2^3(k+1)×2^2÷2^(3m+2)
=2^[3(k+1)+2-(3m+2)]
=2^[3k+3+2-3m-2]
=2^[3k-3m+3]
=2^[-1+3]
=2^2
=4
∵多项式x²-(3k-1)xy-3k²+3mxy-8中不含xy项
∴合并后 xy系数为0
∴-(3k-1)+3m=0
化简后k-m=-1/3
8^k×4÷2^3m+2=(2^3k)×(2^2)÷(2^3m)=2^(3k+2-3m)=2^[3(k-m)+2]=2^(3×1/3+2)=8
【不知看没看得懂啊?】